Database Info

Need help flashing OOS 5.1.8 zip (via twrp!?) bear with me.

New OP6 owner, quite bugged with how this thing works when flashing stuff..
it was a breeze on my 6p, anyways.
i decided to do a "Clean" flash and wiped data/system/dalvik etc.
then tried to flash the Full zip of 5.1.8 (it is a 1.2gb file) and i flashed via TWRP then flashed twrp zip and rebooted recovery/flashed magisk.
but there is no OS installed it says, boots me back into twrp.
my question now is how do i get it back to load up OOS, do i have to use fastboot now .. ?
i dont want it to wipe my whole SD
what do i do, and how do i stop this from happening for next time?
i thought flashing was normal that way, are we not supposed to wipe system with the op phones..?
i had a MOD installed (xXx) and wanted it removed so that i could install another mod ,thus i wiped system/data etc.
please let me know how to fix this, thx !

leondestiny said:
New OP6 owner, quite bugged with how this thing works when flashing stuff..
it was a breeze on my 6p, anyways.
i decided to do a "Clean" flash and wiped data/system/dalvik etc.
then tried to flash the Full zip of 5.1.8 (it is a 1.2gb file) and i flashed via TWRP then flashed twrp zip and rebooted recovery/flashed magisk.
but there is no OS installed it says, boots me back into twrp.
my question now is how do i get it back to load up OOS, do i have to use fastboot now .. ?
i dont want it to wipe my whole SD
what do i do, and how do i stop this from happening for next time?
i thought flashing was normal that way, are we not supposed to wipe system with the op phones..?
i had a MOD installed (xXx) and wanted it removed so that i could install another mod ,thus i wiped system/data etc.
please let me know how to fix this, thx !
Click to expand...
Click to collapse
You need to make sure you are booting the slot you flashed the rom on, A or B.

sting5566 said:
You need to make sure you are booting the slot you flashed the rom on, A or B.
Click to expand...
Click to collapse
how do i do this? i only flashed zip from the root of my SD , there was no option to select either A or B :C
i went into advanced or seomthing and saw SLot a and B i tapped a and reboot sytem now it is stuck on twrp logo.
f** this ab ****.

When u flashed the rom and rebooted it should let u know which one u r flashing on when u flash magisk, the xXx should have been a magisk module so should have been deleted when u wiped data, I would re-download 5.1.8
Wipe all again.
Flash OS
Flash twrp installer
Reboot to twrp
Flash magisk and reboot
---------- Post added at 01:23 PM ---------- Previous post was at 01:22 PM ----------
Did u have the magisk module version of xXx, if so all u had to do was uncheck it and reboot

OnePlus 6 has two partitions like the Pixel 2. For seamless OTA updates. In TWRP go to the Reboot menu and you'll see your currently active slot. It's either A or B. Switch to the other one and reboot. That should do it if you did flash the ROM.

Bradl79 said:
When u flashed the rom and rebooted it should let u know which one u r flashing on when u flash magisk, the xXx should have been a magisk module so should have been deleted when u wiped data, I would re-download 5.1.8
Wipe all again.
Flash OS
Flash twrp installer
Reboot to twrp
Flash magisk and reboot
---------- Post added at 01:23 PM ---------- Previous post was at 01:22 PM ----------
Did u have the magisk module version of xXx, if so all u had to do was uncheck it and reboot
Click to expand...
Click to collapse
man screw this ab partition shet, i will be forced to do a userdata reset..
can you please advise me what not to do to get into this mess again..?
its not fun recopying my data back and forth.
all i tried to do was clean flash and flash the latest rom via twrp..
why does this thing has to be so complex, please tell me if a clean wipe does this mess ?
cant we safely clean wipe this thing or what?
i love the phone, but the flashing stuff is a huge mess imo.

leondestiny said:
man screw this ab partition shet, i will be forced to do a userdata reset..
can you please advise me what not to do to get into this mess again..?
its not fun recopying my data back and forth.
all i tried to do was clean flash and flash the latest rom via twrp..
why does this thing has to be so complex, please tell me if a clean wipe does this mess ?
cant we safely clean wipe this thing or what?
i love the phone, but the flashing stuff is a huge mess imo.
Click to expand...
Click to collapse
You can always just keep a backup of userdata in TWRP but you don't have to wipe data. If you wipe system and flash the full zip, you will get the no os error but you can boot to system anyway. It just thinks there is no os. The bootloop to TWRP is probably related to magisk.

mikex8593 said:
You can always just keep a backup of userdata in TWRP but you don't have to wipe data. If you wipe system and flash the full zip, you will get the no os error but you can boot to system anyway. It just thinks there is no os. The bootloop to TWRP is probably related to magisk.
Click to expand...
Click to collapse
took me an hour or so to get this thing booting up again..
without the need to wipe SD , this is so strange.
i honestly have no idea how i did it, but i am afraid to use twrp now..
this thing is messed up

leondestiny said:
took me an hour or so to get this thing booting up again..
without the need to wipe SD , this is so strange.
i honestly have no idea how i did it, but i am afraid to use twrp now..
this thing is messed up
Click to expand...
Click to collapse
It's relatively easy. Just always remember to flash TWRP and magisk after flashing full ROM zip. It's always a safe bet to erase your lock screen before messing with TWRP as well so it can just decrypt with no password. If you use a magisk ROM, it's all systemless so the only changes that would stay are the ones that would debloat apps or remove system files. Everything would revert back to normal after you uncheck the ROM module in magisk manager.

mikex8593 said:
It's relatively easy. Just always remember to flash TWRP and magisk after flashing full ROM zip. It's always a safe bet to erase your lock screen before messing with TWRP as well so it can just decrypt with no password. If you use a magisk ROM, it's all systemless so the only changes that would stay are the ones that would debloat apps or remove system files. Everything would revert back to normal after you uncheck the ROM module in magisk manager.
Click to expand...
Click to collapse
hmm okay thx, someone suggested me omni rom, but i will need to erase data right?
but my issue is, if in case i wanted to go back to OOS, would i need to erase data again? :l
and also about flashing roms, must they be flashed on both slots..? a and b ?
i have no clue how i got OOS back booting to be honest.. :l

leondestiny said:
hmm okay thx, someone suggested me omni rom, but i will need to erase data right?
but my issue is, if in case i wanted to go back to OOS, would i need to erase data again? :l
and also about flashing roms, must they be flashed on both slots..? a and b ?
i have no clue how i got OOS back booting to be honest.. :l
Click to expand...
Click to collapse
Switching ROMs, it is best to erase data or keep separate data backups for each ROM and restore the associated ones. As far as flashing on both slots, it wouldn't hurt, but it's not necessary unless instructions dictate. The whole reason for the slots is to allow seamless updates while the os is still active. If you experience any issues with bugs that aren't stated to be in the ROM thread, a clean install is always recommended.

mikex8593 said:
Switching ROMs, it is best to erase data or keep separate data backups for each ROM and restore the associated ones. As far as flashing on both slots, it wouldn't hurt, but it's not necessary unless instructions dictate. The whole reason for the slots is to allow seamless updates while the os is still active. If you experience any issues with bugs that aren't stated to be in the ROM thread, a clean install is always recommended.
Click to expand...
Click to collapse
thx mate, so for next time if i were to flash some oos through twrp, i only need to wipe data/cache etc.
then flash the oos zip ? i dont think i had the option to select which Slot to flash it to, so i guess i just have to reboot to the slot that it has it flashed on..?
and also flashing procedure must be like Rom then twrp then reboot twrp then flash magisk yes?

leondestiny said:
took me an hour or so to get this thing booting up again..
without the need to wipe SD , this is so strange.
i honestly have no idea how i did it, but i am afraid to use twrp now..
this thing is messed up
Click to expand...
Click to collapse
No sheet
This is what happened to me LOL and I soft bricked phone. Never ever bricked a phone before.
I tried to flash havoc os, OOS was originally on both A and B.
This process wiped slot B clean (even tho was booting on slot A), and OOS stayed on slot A.
I went to the reboot screen to reboot recovery on slot B and BAM I was bricked locked into fastboot mode.
And people say its easy.
Now I am in msmdownloadtool, I have managed to get it connected, and I can start the recovery but it fails, so I think the phone may be proper bricked.
Anyone getting a oneplus6 I would say these phones seem to have a genuine risk of brick, all I did was try to boot of a slot which TWRP says had no OS and now I have this problem.
---------- Post added at 01:59 ---------- Previous post was at 01:25 ----------
mikex8593 said:
It's relatively easy. Just always remember to flash TWRP and magisk after flashing full ROM zip. It's always a safe bet to erase your lock screen before messing with TWRP as well so it can just decrypt with no password. If you use a magisk ROM, it's all systemless so the only changes that would stay are the ones that would debloat apps or remove system files. Everything would revert back to normal after you uncheck the ROM module in magisk manager.
Click to expand...
Click to collapse
Havoc OS requires Oxygen OOS in both slots.
So I need to somehow get this to work.
I can unbrick the phone now with msmdownloadtool.
After ubricked the bootloader is locked again so I have to start from scratch.
Unlock oem loader in OS
Unlock bootloader in fastboot
Copy zips to phone.
Boot into TWRP and install TWRP, it says it installs to both slots but B bricks phone.
At this point I have oxygen OOS installed via recovery tool on slot A, twrp installed.
If I try to boot in slot B, phone bricks, fastboot loop which doesnt allow you to boot back into twrp so cannot switch back to slot A without msmdownload tool.
So the question is after I have recovered the phone how do I get oxygen OOS onto slot B as well, given I Cannot boot from slot B?
The solution is probably easy to those who know how but seems it isnt documented.

chrcol said:
No sheet
This is what happened to me LOL and I soft bricked phone. Never ever bricked a phone before.
I tried to flash havoc os, OOS was originally on both A and B.
This process wiped slot B clean (even tho was booting on slot A), and OOS stayed on slot A.
I went to the reboot screen to reboot recovery on slot B and BAM I was bricked locked into fastboot mode.
And people say its easy.
Now I am in msmdownloadtool, I have managed to get it connected, and I can start the recovery but it fails, so I think the phone may be proper bricked.
Anyone getting a oneplus6 I would say these phones seem to have a genuine risk of brick, all I did was try to boot of a slot which TWRP says had no OS and now I have this problem.
---------- Post added at 01:59 ---------- Previous post was at 01:25 ----------
Havoc OS requires Oxygen OOS in both slots.
So I need to somehow get this to work.
I can unbrick the phone now with msmdownloadtool.
After ubricked the bootloader is locked again so I have to start from scratch.
Unlock oem loader in OS
Unlock bootloader in fastboot
Copy zips to phone.
Boot into TWRP and install TWRP, it says it installs to both slots but B bricks phone.
At this point I have oxygen OOS installed via recovery tool on slot A, twrp installed.
If I try to boot in slot B, phone bricks, fastboot loop which doesnt allow you to boot back into twrp so cannot switch back to slot A without msmdownload tool.
So the question is after I have recovered the phone how do I get oxygen OOS onto slot B as well, given I Cannot boot from slot B?
The solution is probably easy to those who know how but seems it isnt documented.
Click to expand...
Click to collapse
Fastboot boot recovery. Img
Flash oos full ROM zip
Flash recovery. Zip
Reboot recovery
Flash oos full ROM zip AGAIN
flash twrp. Zip AGAIN
Reboot recovery
Flash magisk if you want root.
Make sure your using the correct twrp aswell. I recommend bluespark v86

chrcol said:
And people say its easy.
Click to expand...
Click to collapse
it is not easy, i make backups of my whole phone every 2weeks because i am a flashaholic i see myself switching from aosp back to oos and vice versa (i love oos) i actually gave up on flashing roms some weeks ago tried to stick to oos only so that i wont be bothered with bricks for whatver reason (and not being forced to use msmtool) , it is frustrating.
you always have to make sure you are not flashing a rom that has an older security patch , e.g november build of oos if you flash aosp rom with october build you might brick, so the rom has to be either on november security patch or newer e.g december.
it is so confusing as you even have to use the latest twrp always or else you can mess it up again..
always make backups is my advice.

leondestiny said:
it is not easy, i make backups of my whole phone every 2weeks because i am a flashaholic i see myself switching from aosp back to oos and vice versa (i love oos) i actually gave up on flashing roms some weeks ago tried to stick to oos only so that i wont be bothered with bricks for whatver reason (and not being forced to use msmtool) , it is frustrating.
you always have to make sure you are not flashing a rom that has an older security patch , e.g november build of oos if you flash aosp rom with october build you might brick, so the rom has to be either on november security patch or newer e.g december.
it is so confusing as you even have to use the latest twrp always or else you can mess it up again..
always make backups is my advice.
Click to expand...
Click to collapse
If you're installing havoc os, make sure you're using latest bluespark TWRP first. Reboot recovery, flash oos, flash TWRP, reboot recovery, flash havoc gapps and magisk then reboot. The only difference in a/b partition is that there's a few extra steps in the flashing process. You don't have to flash to both slots to have havoc, but you also shouldn't be manually changing the slot in TWRP to try to boot a specific slot unless you know what you're doing.

disabled encryption

I have successfully decrypted my essential phone using the dm verity disabler by zackptg. Need to test it some more, but twrp boots after flashing it, instantly.it doesn't have that lag

jacksummers said:
I have successfully decrypted my essential phone using the dm verity disabler by zackptg. Need to test it some more, but twrp boots after flashing it, instantly.it doesn't have that lag
Click to expand...
Click to collapse
were u rooted before or not? did u have to format everything in twrp?
edit it actually works!!!!!! I'm unencrypted...i can go into twrp while a pin is set....i can flash magisk with first boot of a rom and it boots...!!!!!

This is a huge advancement. I didn't think it worked until I booted into twrp. And it was instantaneous.so before I flashed the dm verity decryption zip, I did indeed wipe everything on both slots, then mounted system in twrp and flashed the zip, then I flashed the ROM.i will be switching back to stock to test if it stays decrypted later today. I'm running a gsi,(benzo ROM+ all my own customizations)rooted,with all the trimmings) the same mentality will have to follow, but it will be interesting to see how it goes with flashing stock fresh. I imagine restoring my nandroid will be fine and stay decrypted, but probably will have to flash stock, then after setup, back to twrp, wipe factory reset and flash the dm verity decryption zip..I think, I gotta just do it to be sure. Anyone who does this should share notes and that will help the community.
Here is a good question, wtf can I do to have lte again. ever since pie official, I lost lte.phone drops to 3g during calls only. I discovered this while searching for a fix for my volte. Hence,, switching to gsi's because they don't have volte and neither does my stock, even with fresh installs.i have t mobile.all the betas it worked fine.

Here's the thread folks
https://forum.xda-developers.com/android/software/universal-dm-verity-forceencrypt-t3817389
Thanks to Zackptg

jacksummers said:
This is a huge advancement. I didn't think it worked until I booted into twrp. And it was instantaneous.so before I flashed the dm verity decryption zip, I did indeed wipe everything on both slots, then mounted system in twrp and flashed the zip, then I flashed the ROM.i will be switching back to stock to test if it stays decrypted later today. I'm running a gsi,(benzo ROM+ all my own customizations)rooted,with all the trimmings) the same mentality will have to follow, but it will be interesting to see how it goes with flashing stock fresh. I imagine restoring my nandroid will be fine and stay decrypted, but probably will have to flash stock, then after setup, back to twrp, wipe factory reset and flash the dm verity decryption zip..I think, I gotta just do it to be sure. Anyone who does this should share notes and that will help the community.
Here is a good question, wtf can I do to have lte again. ever since pie official, I lost lte.phone drops to 3g during calls only. I discovered this while searching for a fix for my volte. Hence,, switching to gsi's because they don't have volte and neither does my stock, even with fresh installs.i have t mobile.all the betas it worked fine.
Click to expand...
Click to collapse
How did u get wifi to work on gsi..for me i can seem to get it working..and im using the last 8.1 vendor....for the lte go into dialer and *#*#4636#*#* and change the lte/utms/cdma setting around until u get it

Tech_Savvy said:
How did u get wifi to work on gsi..for me i can seem to get it working..and im using the last 8.1 vendor....for the lte go into dialer and *#*#4636#*#* and change the lte/utms/cdma setting around until u get it
Click to expand...
Click to collapse
I have found that after booting up a gsi, factory reset it. Then be sure not to root with magisk. Every time I tried it killed my data and wifi. Use phhhsuperuser ab zip. I think I may have had to flash my modem.img a time as well after the initial install.
And yeah I got it kinda, still no lte. I'm gonna try a modem img from the pie firmware..I think it is the problem

Has anyone had success in decrypting on stock? I cant get it and then i lose touch with the phone booted up. So in other words do not try to decrypt stock. U will wreck your phone and the only way to fix it is to flash stock via fastboot AND adb sideload. One or the other doesnt fix it for some reason. Has to be both.

jacksummers said:
Has anyone had success in decrypting on stock? I cant get it and then i lose touch with the phone booted up. So in other words do not try to decrypt stock. U will wreck your phone and the only way to fix it is to flash stock via fastboot AND adb sideload. One or the other doesnt fix it for some reason. Has to be both.
Click to expand...
Click to collapse
Were you trying on stock oreo or pie?

governmentissuejoe said:
Were you trying on stock oreo or pie?
Click to expand...
Click to collapse
Both

jacksummers said:
Both
Click to expand...
Click to collapse
I tried it on stock Oreo and it works.

governmentissuejoe said:
I tried it on stock Oreo and it works.
Click to expand...
Click to collapse
Ok cool, I was worried I did this as a fluke. What was the steps u did?

jacksummers said:
Ok cool, I was worried I did this as a fluke. What was the steps u did?
Click to expand...
Click to collapse
So these are all the steps I took to get it to work. All of these steps may or may not be necessary. I used aer0zer0's stock dump for the lastest release of oreo and flashed the wipe all bat. It did its thing and wiped and flashed on both slots. I booted into the rom and finished initial setup and enabled adb in developer settings. I rebooted to bootloader and flashed twrp to inactive slot. I booted into recovery and selected the format data option and typed yes. I rebooted to bootloader and reflashed twrp. When I booted into recovery I transferred the stockboot.img, magisk 17.1 zip, and disable encryption zip to the phone. I flashed the stockboot.img to the boot partition. I then flashed the disable encryption zip. I then mounted the system partition and flashed the magisk zip. Finally, I rebooted into the rom and set pin and fingerprint. I installed EX Kernel Manager and created a backup of the decrypted magisked boot.img just in case. I flashed twrp through ex kernel manager and rebooted to recovery. Everything stayed decrypted. I flashed my newly created boot.img backup and booted back to my rom. Thats it. I hope I remembered everything. I hope this helps. Again, I do not know if all the steps I took are required but it worked for me.

Cannot boot phone after updating

The problem is kinda complicated. Previously, I flashed a custom ROM on my phone (a modified version of Oxygen OS). Just now, I updated my phone using the official ROM downloaded from Oneplus's official site (no idea what I was thinking), and I was only able to boot into the stock recovery. So, I tried reinstalling the TWRP recovery. I was able to boot the phone, but upon boot, it would say something like "Settings stopped working" and it would shut down immediately. I tried flashing a couple of different ROMs using the Install option in TWRP, but I still get the same error when booting my phone. Is there anyway to solve this problem? If not, would there be any way for me to recover my files at least?

Go back to factory stock using the MSM tool. If you can get to TWRP you can backup your stuff.

CosmicInsight said:
Go back to factory stock using the MSM tool. If you can get to TWRP you can backup your stuff.
Click to expand...
Click to collapse
I am able to get to TWRP right now. However, I did noticed that the Data partition in the TWRP Backup option is only 76MB. Does this mean that my data's gone already somehow?

leniumC said:
I am able to get to TWRP right now. However, I did noticed that the Data partition in the TWRP Backup option is only 76MB. Does this mean that my data's gone already somehow?
Click to expand...
Click to collapse
Yeah, probably.

Oneplus 7 Pro Bootloop after overlay install, still booting into recovery

Hi guys. Really need your help. Oneplus 7pro ,european version running 10.0.4 software, latest magisk 20.4 i think? and twrp. Everything was running fine until earlier when I installed a system ui overlay (one i've used before) and now my phone is in a boot loop. I can access TWRP, I've run the substratum overlay uninstaller zip and removed all magisk modules but still i'm in a bootloop. I've never had a proper bootloop before and i'm very frustrated. I've googled for the past few hours and removed everything I can think of that could be causing issues. Does anyone have some advice that doesn't end with me losing all my data? I have a backup but its from a month ago. I've never had this issue before so i'm a little stuck. Thanks
Edit. Phone is fully accessible through my laptop I can see all my files and connect to it. I just cannot get it to boot,surely its a simple fix?

Bxperiaz3 said:
Hi guys. Really need your help. Oneplus 7pro ,european version running 10.0.4 software, latest magisk 20.4 i think? and twrp. Everything was running fine until earlier when I installed a system ui overlay (one i've used before) and now my phone is in a boot loop. I can access TWRP, I've run the substratum overlay uninstaller zip and removed all magisk modules but still i'm in a bootloop. I've never had a proper bootloop before and i'm very frustrated. I've googled for the past few hours and removed everything I can think of that could be causing issues. Does anyone have some advice that doesn't end with me losing all my data? I have a backup but its from a month ago. I've never had this issue before so i'm a little stuck. Thanks
Edit. Phone is fully accessible through my laptop I can see all my files and connect to it. I just cannot get it to boot,surely its a simple fix?
Click to expand...
Click to collapse
Can you boot in TWRP? if can try changing slot and boot from it

Mervingio said:
Can you boot in TWRP? if can try changing slot and boot from it
Click to expand...
Click to collapse
Hi,yes I can. Its loading the logo now so i'll wait and see what happens. If that works then what should be the next thing I do?
Edit: Slot B seems to be bootlooping on the logo unless its meant to take a few minutes
Is there a way to recover without wiping my data?
So slot A sits on the caution device rooted screen then defaults to the fastboot rescue mode which allows me to select reboot to recovery which is twrp. From there I have full access to the phone but still not booting to system. Slot B passes the fastboot screen and hangs on the one plus logo just circling around. This is my first rooted phone and I haven't had any problems until now so I'm hoping its something simple because I didnt do anything big to cause it. Hopefully someone has some insight.

Can I just sideload the current version of OOS i'm running using TWRP and not lose my data?

Bxperiaz3 said:
Can I just sideload the current version of OOS i'm running using TWRP and not lose my data?
Click to expand...
Click to collapse
Yes

MrSteelX said:
Yes
Click to expand...
Click to collapse
Will I lost root or relock the bootloader? I'm trying to find the least destructive way to get back to what I had which was oos 10 with twrp and magisk.

Uninstalled magisk and was able to reboot. However reflashing it as i want to retain root makes it bootloop again. Any possible fix for this that isn't a factory reset and reroot?

I can't get substratum or substratum themes to work on any rom or stock, nothing happens after reboots.....or everything turns this weird orange theme. Then one time it corrupted the whole OS and I had to wipe.

try to Dirty flash the same Oxygen version
it will not Wipe your Data or internal storage

i6rb said:
try to Dirty flash the same Oxygen version
it will not Wipe your Data or internal storage
Click to expand...
Click to collapse
Thanks, i'll try this. Will I need to install TWRP again once I do this or is it unaffected?

Tried to dirty flash the same stock rom from TWRP but I don't think it did it properly. Can I dirty flash stock rom, flash magisk then try reboot to system?
Any help greatly appreciated.

how to know if it's a bootloop?

hello i was upgrading from stock 9.0.7 to 9.0.9, my bootloader is unlocked and twrp is a permanent one, the phone is also rooted. i wiped system then flashed the 9.0.9 then flashed the 4.0.4 twrp, rebooted into twrp, flashed latest magisk, rebooted into twrp and then pressed reboot into system. the phone is encrypted. the booting animation has been on for 20-30 minutes at this point. is it a bootloop? why what did i do wrong? thanks

@seth wellington
Try formatting data them reboot system. That should get you booted up.
Never wipe system or vendor on these devices and always when flashing a rom flash TWRP installer zip or you won't have twrp because of where recovery is located which is same place as boot.img and it has to be installed when flashing a rom or update to a rom or it won't be present.
How I flash OOS on my once T-Mobile now converted international/global OnePlus 6t.
Boot TWRP
Flash OOS global 10.3.6
Flash TWRP installer
Flash finalize
Format data
Reboot system
How I install a rom on my converted OnePlus 6t. This installation process varies depending on whether or not whatever rom I'm installing comes with gapps and or TWRP and of course you don't want to install global OOS on another model device. Since I converted my T-Mobile OnePlus 6t using guide and msm tool I now use global or international OnePlus 6t roms, firmware... Example Pixel Experience rom installation:
Boot TWRP
Flash OOS 10.3.6 global from repo xda thread
Flash Pixel Experience rom
Flash TWRP installer zip
Flash finalize zip
Format data
Reboot system.
Start to set up device then at some point enable developer options and usb debugging and doable any lock screen and boot twrp and flash magisk for root and reboot system. That is how I install a rom that has gapps but not twrp included in rom zip. Finalize can he found with a quick search on xda. It copies firmware to other slot on your AB partition device so that you don't have to. Saves 5-6 minutes and works great.
Edit
What you could have done is just flash your updated OOS , flash TWRP installer zip, reboot recovery, flash magisk, reboot system. That's what I would have done updating OOS ..
Hope this helps.
Sent from my OnePlus6T using XDA Labs

flash713 said:
@seth wellington
Try formatting data them reboot system. That should get you booted up.
Never wipe system or vendor on these devices and always when flashing a rom flash TWRP installer zip or you won't have twrp because of where recovery is located which is same place as boot.img and it has to be installed when flashing a rom or update to a rom or it won't be present.
How I flash OOS on my once T-Mobile now converted international/global OnePlus 6t.
Boot TWRP
Flash OOS global 10.3.6
Flash TWRP installer
Flash finalize
Format data
Reboot system
How I install a rom on my converted OnePlus 6t. This installation process varies depending on whether or not whatever rom I'm installing comes with gapps and or TWRP and of course you don't want to install global OOS on another model device. Since I converted my T-Mobile OnePlus 6t using guide and msm tool I now use global or international OnePlus 6t roms, firmware... Example Pixel Experience rom installation:
Boot TWRP
Flash OOS 10.3.6 global from repo xda thread
Flash Pixel Experience rom
Flash TWRP installer zip
Flash finalize zip
Format data
Reboot system.
Start to set up device then at some point enable developer options and usb debugging and doable any lock screen and boot twrp and flash magisk for root and reboot system. That is how I install a rom that has gapps but not twrp included in rom zip. Finalize can he found with a quick search on xda. It copies firmware to other slot on your AB partition device so that you don't have to. Saves 5-6 minutes and works great.
Edit
What you could have done is just flash your updated OOS , flash TWRP installer zip, reboot recovery, flash magisk, reboot system. That's what I would have done updating OOS ..
Hope this helps.
Sent from my OnePlus6T using XDA Labs
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Thank you very much for your reply. Unfortunately I couldn't wait for that long and I had to do something right then. After some attempts I also lost my twrp and was left without a functioning recovery, so I had to look for help and some people helped me go through unbricking through the msm tool.
The thing is i just really want to always flash clean so that the phone doesn't lag and works properly, I had no idea you shouldn't wipe system... The guide that I followed said that when updating oxygen manually you have to wipe system so I thought nothing would go wrong. I still don't know what caused a bootloop since that guide was a verified one. Thanks a lot for your help. So if I'm reading it correctly, you have to do the wipes after you've installed the system, not before?

seth wellington said:
Thank you very much for your reply. Unfortunately I couldn't wait for that long and I had to do something right then. After some attempts I also lost my twrp and was left without a functioning recovery, so I had to look for help and some people helped me go through unbricking through the msm tool.
The thing is i just really want to always flash clean so that the phone doesn't lag and works properly, I had no idea you shouldn't wipe system... The guide that I followed said that when updating oxygen manually you have to wipe system so I thought nothing would go wrong. I still don't know what caused a bootloop since that guide was a verified one. Thanks a lot for your help. So if I'm reading it correctly, you have to do the wipes after you've installed the system, not before?
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Quit a few pretty well known developers here on xda (AOSiP op is one and there are more) say not to wipe system or vendor in their first posts of their custom rom threads. The way I describe how I install works 100% always and is the cleanest possible installation. Formatting data when installing a new rom at the end of install process does all the wiping needed to make sure nothing is left from the past and everything is clean. I used to wipe various partitions but on other devices. The install directions I use are originally from the PiXeN rom developers op. I've been flashing roms since the Nexus S days. Not saying that means anything other than I'm kinda old now. ? But that install process has never failed me once and I've flashed I'm sure hundreds of times on this device.. When I update i just flashing the updated rom over current and don't wipe anything then flashing twrp installer zip, reboot recovery flash magisk reboot system or if gapps are needed when I reboot recovery flash gapps..Unless it's a major OS update that's always worked for me.
Possibly not formatting data caused boot loop.. I know when going from OOS to AOSP rom format data is mandatory or it won't boot system.. I never flash magisk during initial flash. I always boot system first then at some point boot twrp and flash magisk. Try that next round and see if it turns out better. The whole AB partition deal made me feel like I was really old and retarded.
If I was updating OOS I would boot recovery, flash OOS, flash twrp installer zip reboot recovery, flash magisk, reboot system. Check out the finalize script xda thread. There are two here. The original person who made finalize has a thread and another user has another finalize thread. I believe in guides section of OnePlus 6t. With Android there are always more than a few ways to achieve something you know ... But what I post here is what I've been doing and I've flashed 400-500 times at least on this device.
Sent from my OnePlus6T using XDA Labs

@flash713
I totally trust you and respect anything you say and recommend me to do. Thanks a lot for all the instructions and clarification. I've been into android far less time than you — only since oneplus one. I'm extremely bad with tech but even with that phone j somehow managed to get bootloops or half-bricks ten times less than with the oneplus 6. And back then in 2015 I was way more enthusiastic: flashing twice a month loads and loads of roms. Of course it wasn't my personal achievement, I was still simply following detailed and carefully written instructions on forums on how to flash a particular rom in a particular way, but hey, at least I somehow managed it.
Now in this case I'm assuming it's the a/b partitions they've introduced that have completely changed the process and ways of flashing to the point that I stick to the guides and still get bootloops lol. That unbricking process was a huge stress for me, I don't think I'm going to touch anything in my phone for a while now. And I'm on the latest 10.3.6 oxygen so it's alright. Thank you for your help buddy

seth wellington said:
@flash713
I totally trust you and respect anything you say and recommend me to do. Thanks a lot for all the instructions and clarification. I've been into android far less time than you — only since oneplus one. I'm extremely bad with tech but even with that phone j somehow managed to get bootloops or half-bricks ten times less than with the oneplus 6. And back then in 2015 I was way more enthusiastic: flashing twice a month loads and loads of roms. Of course it wasn't my personal achievement, I was still simply following detailed and carefully written instructions on forums on how to flash a particular rom in a particular way, but hey, at least I somehow managed it.
Now in this case I'm assuming it's the a/b partitions they've introduced that have completely changed the process and ways of flashing to the point that I stick to the guides and still get bootloops lol. That unbricking process was a huge stress for me, I don't think I'm going to touch anything in my phone for a while now. And I'm on the latest 10.3.6 oxygen so it's alright. Thank you for your help buddy
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Np. My real first name is Seth. Haha. Cool name btw. I just installed OOS 10.3.7 on my 6t. I was notified of the update yesterday via oxygen updater app from play store. Good handy app to have. I would have never known 10.3.7 was out or at least not so soon if it wasn't for that app. I believe it auto notified me too. I don't remember setting it up. Android has changed soooo much you know.. I love my OnePlus 6t though. Definitely one of my most favorite devices I've ever used. What's new today is gone at some point and replaced with "better.." lol. Not always better imo anyway. Glad I could help. Feel free to message me any time. Good day to you.