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Unable to install any custom roms...

I have flashed stock from googles web site and I have tried everything I can to get a custom rom back on this device. I have tried everything. every thing I do just boots to regular google. But I can flash twrp, and magisk on stock and it works. OEM is unlocked but as soon as I flash a rom then twrp and sign it, it says its successful for everything but when I boot to system it just reboots a couple times then boots but up to stock. Any one have any ideas?

KingAroan said:
I have flashed stock from googles web site and I have tried everything I can to get a custom rom back on this device. I have tried everything. every thing I do just boots to regular google. But I can flash twrp, and magisk on stock and it works. OEM is unlocked but as soon as I flash a rom then twrp and sign it, it says its successful for everything but when I boot to system it just reboots a couple times then boots but up to stock. Any one have any ideas?
Click to expand...
Click to collapse
This is normal. Your custom ROM is flashing to the opposite slot your on. When your done u need to reboot to bootloader and boot twrp then install TWRP again and install verified boot signer zip. If not just going to loop once and boot to the slot that works

mac796 said:
This is normal. Your custom ROM is flashing to the opposite slot your on. When your done u need to reboot to bootloader and boot twrp then install TWRP again and install verified boot signer zip. If not just going to loop once and boot to the slot that works
Click to expand...
Click to collapse
I will try that's next time. I just went through hell trying get back on the RR ROM and rooted with magisk. But I finally got it haha. Took about 20 stock flash's to get it finally working

KingAroan said:
I will try that's next time. I just went through hell trying get back on the RR ROM and rooted with magisk. But I finally got it haha. Took about 20 stock flash's to get it finally working
Click to expand...
Click to collapse
Yea once you do it a couple of times you will have it down. Just remember from May bootloader's on, you have to use that VBS zip. Also keep track of what slot your on when your flashing

mac796 said:
Yea once you do it a couple of times you will have it down. Just remember from May bootloader's on, you have to use that VBS zip. Also keep track of what slot your on when your flashing
Click to expand...
Click to collapse
I still don't get the slot thing. I was figuring that slot a was stock and slot b was any custom rom guess that wrong

KingAroan said:
I still don't get the slot thing. I was figuring that slot a was stock and slot b was any custom rom guess that wrong
Click to expand...
Click to collapse
No there the same. You can put whatever on either one. There for normal use. seamless updates they call it I believe.

KingAroan said:
I still don't get the slot thing. I was figuring that slot a was stock and slot b was any custom rom guess that wrong
Click to expand...
Click to collapse
The different slots are for seamless updates. If you're using the stock rom and taking OTA's, the OTA gets flashed to whatever slot is currently inactive. It used to be when you did an OTA, the OTA got downloaded and then you'd be prompted to reboot to install the update. When you rebooted, the update would get installed but you had to sit and wait for it to install before you could use your phone again. With the two slots, it now downloads the update and installs it to the inactive slot while you continue to use your phone. Eventually you get prompted to reboot but instead of having to wait for it to install, it just reboots like any other time you reboot the phone and there is no wait for the update to install. It's already installed. When it reboots, it switches to the slot that was previously inactive because that's where the update is installed to. So, if you're on slot A when the update is downloaded and installed, you'll be using slot B after you reboot. The next month when the update comes out, it will get installed to the other slot again and you'll once again be using slot A and so on and so on for every month after that.
For a custom rom, they can be installed on either slot. It just depends on which slot is currently active. If slot A is the slot that's currently active, TWRP will flash the rom to slot B. If B is active, the rom will get flashed to A. Anything else gets flashed to the slot that is currently active (SuperSU, Vendor files or what have you). That's why after flash the rom, you have to reboot the phone (either reboot to recovery or the OS) before flashing the rest of whatever it is you want to flash. If you don't reboot before flashing SuperSU or whatever, it won't get flashed to the same slot the rom got flashed to and obviously, this causes issues. Bottom line is, slot A or B, it has nothing to do with whether it's a stock or custom rom. Whichever slot is inactive when you flash a rom is the slot the rom will end up on.

robocuff said:
The different slots are for seamless updates. If you're using the stock rom and taking OTA's, the OTA gets flashed to whatever slot is currently inactive. It used to be when you did an OTA, the OTA got downloaded and then you'd be prompted to reboot to install the update. When you rebooted, the update would get installed but you had to sit and wait for it to install before you could use your phone again. With the two slots, it now downloads the update and installs it to the inactive slot while you continue to use your phone. Eventually you get prompted to reboot but instead of having to wait for it to install, it just reboots like any other time you reboot the phone and there is no wait for the update to install. It's already installed. When it reboots, it switches to the slot that was previously inactive because that's where the update is installed to. So, if you're on slot A when the update is downloaded and installed, you'll be using slot B after you reboot. The next month when the update comes out, it will get installed to the other slot again and you'll once again be using slot A and so on and so on for every month after that.
For a custom rom, they can be installed on either slot. It just depends on which slot is currently active. If slot A is the slot that's currently active, TWRP will flash the rom to slot B. If B is active, the rom will get flashed to A. Anything else gets flashed to the slot that is currently active (SuperSU, Vendor files or what have you). That's why after flash the rom, you have to reboot the phone (either reboot to recovery or the OS) before flashing the rest of whatever it is you want to flash. If you don't reboot before flashing SuperSU or whatever, it won't get flashed to the same slot the rom got flashed to and obviously, this causes issues. Bottom line is, slot A or B, it has nothing to do with whether it's a stock or custom rom. Whichever slot is inactive when you flash a rom is the slot the rom will end up on.
Click to expand...
Click to collapse
Holy ****, i didnt know that part, i just thought it flashed it to your current slot and when you rebooted into system, the slot didnt change.....brb but first a quick titanium backup

Booting/Recovery issues, Need help. (yes I researched)

Going to try to give as much information as possible so it will help me figure this out.
I have been working with Renovate module and rom/ Different magisk etc.
The display within the settings has been always messed up and crashes upon using.
So someone suggested a factory reset.
Pre-reset. I did a nandroid backup as well as Titanium backup , and google sync just in case.
Then everything was fine. But had some issues with Magisk installer. Basicly it was not correct and root didn't work correctly.
Flashing some module updates and newest Renovate update.
Then going back to reboot, all of a sudden it goes into fastboot mode.
Tried restarting in recovery , and it would not. It always wants to go to fastboot mode.
Posting and getting some advice (Thanks) they said I bricked my phone.
I tried everything I could to get data that I did a backup of off my phone (This is where I with it was micro SD)
Finally got into TWRP VIA fastboot boot ( had to change active slot) and it was encrypted.....
Booted again using Bluespark via fastboot (Think it was slot b this time) and was able to get a full SD backup onto PC.
Thinking this is going good, I flashed bluespark into slot b?.
Well it never took, and just showed a white light on top , the notification light.
Tried a few flashing VIA fastboot, and last thing I did was fastboot boot an official TWRP, to a slot that worked.
Tried Msmdownloadtool, and various other ways to get stuff going.
Tried Fastboot flashall and fails as well
Can anyone help me get the phone back so recovery works or help in any way?

eracet said:
Going to try to give as much information as possible so it will help me figure this out.
I have been working with Renovate module and rom/ Different magisk etc.
The display within the settings has been always messed up and crashes upon using.
So someone suggested a factory reset.
Pre-reset. I did a nandroid backup as well as Titanium backup , and google sync just in case.
Then everything was fine. But had some issues with Magisk installer. Basicly it was not correct and root didn't work correctly.
Flashing some module updates and newest Renovate update.
Then going back to reboot, all of a sudden it goes into fastboot mode.
Tried restarting in recovery , and it would not. It always wants to go to fastboot mode.
Posting and getting some advice (Thanks) they said I bricked my phone.
I tried everything I could to get data that I did a backup of off my phone (This is where I with it was micro SD)
Finally got into TWRP VIA fastboot boot ( had to change active slot) and it was encrypted.....
Booted again using Bluespark via fastboot (Think it was slot b this time) and was able to get a full SD backup onto PC.
Thinking this is going good, I flashed bluespark into slot b?.
Well it never took, and just showed a white light on top , the notification light.
Tried a few flashing VIA fastboot, and last thing I did was fastboot boot an official TWRP, to a slot that worked.
Tried Msmdownloadtool, and various other ways to get stuff going.
Tried Fastboot flashall and fails as well
Can anyone help me get the phone back so recovery works or help in any way?
Click to expand...
Click to collapse
UPDATE: When booting into TWRP 3.2.2.0 it gives me encrypted files. When booting into TWRP 3.2.3.0 it gives me non-encyrpted files and asks for password.
Booting anything to slot A gives me a load error. failed to authenticate.
Update2: Now I cannot get Bluspark TWRP or stock recovery to load VIA Fastboot. Only TWRP 3.2.3.0 works and loads correctly
Update 3: Keep having to do different versions of TWRP to get anything going, even tried OTA and did not work.
Update 4: Phone wants to boot into Qualcomm HS-USB Diagnostics mode when light is on.

Found you
Next time tag me
I'm the same guy on the oneplus forums
Send me a private message here or on the oneplus forums and I'll take it from there

Update: I have resolved the issue. Please do not post any further comments on this because
The issue is already resolved, duh

OnePlus 7 Pro Flashing doesn't work properly

Hey guys,
so first of all I wanna let you know that my device is not bricked or something (it was a couple of times though).
But let's get started with my issue. For me, personally, I have experienced that the slot system (A/B Slot) doesn't work that good. I had a OnePlus 3T before and I never had any problems with flashing, but now...
My impression is that it's a lot easier to brick its' device than before. Every time I want to flash a new OS I gotta use the msmtool.
1. I boot to recovery mode through the OS
2. I boot to fastboot trough the OOS stock recovery
3. I try to flash TWRP to erase the system
4. Flashing works, but I can no longer boot into recovery mode
5. I have a bootloop (fastboot mode only)
6. I have to use that msmtool
7. I have some old OOS (9.5.5 or something)
8. I unlock the bootloader through the OS & fastboot
9. I boot into TWRP, delete everything and flash another ROM
10. Everything works and the cicle begins again​
I really don't know why I'm always stuck in that bootloop... Maybe you guys could help me and give me your personal opinion on the slot system?

I totally know that feeling. I started with a tmo op7p, flashed international, unlocked bootloader, try to boot TWRP, and nope. Switch slot, it works. Flash it, great. Make a backup with TWRP of my working system, flash ROMaur, won't do anything but boot to TWRP. Open TWRP file manager and every file on internal storage is a ton of folders with jumbled strings of letters and numbers for names. MSM tool back to intl stock, try lineage... Nope. Keeps telling me to do a factory reset. I did, but I do another and still boot loop. MSM to intl, try other roms, same outcome.
I can unlock my bootloader and root it and run intl stock but that's it.

oxadedzn said:
Hey guys,
so first of all I wanna let you know that my device is not bricked or something (it was a couple of times though).
But let's get started with my issue. For me, personally, I have experienced that the slot system (A/B Slot) doesn't work that good. I had a OnePlus 3T before and I never had any problems with flashing, but now...
My impression is that it's a lot easier to brick its' device than before. Every time I want to flash a new OS I gotta use the msmtool.
1. I boot to recovery mode through the OS
2. I boot to fastboot trough the OOS stock recovery
3. I try to flash TWRP to erase the system
4. Flashing works, but I can no longer boot into recovery mode
5. I have a bootloop (fastboot mode only)
6. I have to use that msmtool
7. I have some old OOS (9.5.5 or something)
8. I unlock the bootloader through the OS & fastboot
9. I boot into TWRP, delete everything and flash another ROM
10. Everything works and the cicle begins again
I really don't know why I'm always stuck in that bootloop... Maybe you guys could help me and give me your personal opinion on the slot system?
Click to expand...
Click to collapse
Doing it wrong.
If you are currently rooted and a new OS comes out you can do the following and you don't need to flash with TWRP or use a computer.
1. Download the full OTA. You can use Oxygen updater to do that or use a link in the stock ROM section on this site.
2. Make sure you have the Magisk and the TWRP zip on the phone.
3. Do a local update in the system area but do not reboot.
4. Launch Magisk manager and select install.
5. Use the OTA install option to inactive slot.
6. Now you can reboot. You have installed the new OS and root also.
7. Once rebooted do another local install. This will install in the slot that you were just running. It will fail the first time, but work the second time.
8. Repeat 4.
9. Repeat 5.
10 . Repeat 6.
You now have both slots with the same OS and rooted.
If you want to install TWRP.
Launch Magisk and install the TWRP zip.
Reboot into recovery. This is important because you cannot boot in slot with TWRP unless Magisk in installed.
Now flash the Magisk image file.
Now in TWRP select the other slot and reboot into recovery.
In recovery install Magisk image to this slot.
Now you have TWRP and Magisk in both slots.
I have done it that way since 9.5.7 and have not had an issue.

tech_head said:
Doing it wrong.
If you are currently rooted and a new OS comes out you can do the following and you don't need to flash with TWRP or use a computer.
1. Download the full OTA. You can use Oxygen updater to do that or use a link in the stock ROM section on this site.
2. Make sure you have the Magisk and the TWRP zip on the phone.
3. Do a local update in the system area but do not reboot.
4. Launch Magisk manager and select install.
5. Use the OTA install option to inactive slot.
6. Now you can reboot. You have installed the new OS and root also.
7. Once rebooted do another local install. This will install in the slot that you were just running. It will fail the first time, but work the second time.
8. Repeat 4.
9. Repeat 5.
10 . Repeat 6.
You now have both slots with the same OS and rooted.
If you want to install TWRP.
Launch Magisk and install the TWRP zip.
Reboot into recovery. This is important because you cannot boot in slot with TWRP unless Magisk in installed.
Now flash the Magisk image file.
Now in TWRP select the other slot and reboot into recovery.
In recovery install Magisk image to this slot.
Now you have TWRP and Magisk in both slots.
I have done it that way since 9.5.7 and have not had an issue.
Click to expand...
Click to collapse
Irrelevant ISH, but ever had that one bootloop where it only bootloops at the "Warning Bootloader unlocked screen" constantly? When I try to access fastboot, it'll just go straight to recovery without even waiting for input (to my luck, of course, until I had to uninstall magisk in full, reinstall, make sure TWRP was reflashed and did the "Fix recovery bootloop", though that wasn't the seemingly the issue). The issue got resolved, but it was very scary for that to have happened as soon as i enabled sudohide (I always had it work, but with huge problems, but never enough to bootloop me to death)

JhinCuatro said:
Irrelevant ISH, but ever had that one bootloop where it only bootloops at the "Warning Bootloader unlocked screen" constantly? When I try to access fastboot, it'll just go straight to recovery without even waiting for input (to my luck, of course, until I had to uninstall magisk in full, reinstall, make sure TWRP was reflashed and did the "Fix recovery bootloop", though that wasn't the seemingly the issue). The issue got resolved, but it was very scary for that to have happened as soon as i enabled sudohide (I always had it work, but with huge problems, but never enough to bootloop me to death)
Click to expand...
Click to collapse
If you install TWRP on a 7 Pro without installing Magisk you will absolutely boot loop. If you wipe the system in one slot and have a differing ROM from the active slot you can in fact boot loop. Although the systems are different, the settings between the systems are shared.

Sorry to say, but nothing about those steps is correct. Follow some guides in the guides section to get aquatinted with the A/B system

Arden144 said:
Sorry to say, but nothing about those steps is correct. Follow some guides in the guides section to get aquatinted with the A/B system
Click to expand...
Click to collapse
You are absolutely incorrect.
When going from 9.5.10 to 9.5.11 and all my previous upgrades it has been:
1. Local install of the new OS with a full OTA since I am rooted.
2. Do not reboot.
3. Install Magisk to inactive slot.
4. Reboot (Slot will automatically switch to the one recently updated).
5. Local install of OS into the other slot, fails first time, do it again.
6. Install Magisk into inactive slot.
7. Reboot. (Slot will switch to recently updated slot).
8. Both slots now have latest OS and are rooted.
You can also install TWRP if you like.
No computer needed.
This works.

tech_head said:
You are absolutely incorrect.
When going from 9.5.10 to 9.5.11 and all my previous upgrades it has been:
1. Local install of the new OS with a full OTA since I am rooted.
2. Do not reboot.
3. Install Magisk to inactive slot.
4. Reboot (Slot will automatically switch to the one recently updated).
5. Local install of OS into the other slot, fails first time, do it again.
6. Install Magisk into inactive slot.
7. Reboot. (Slot will switch to recently updated slot).
8. Both slots now have latest OS and are rooted.
This works.
Click to expand...
Click to collapse
That's completely unnecessary and just avoiding the purpose of the a/b system.
All it would take is:
1. Local install
2. Install magisk to inactive slot

I'm so confused. Two version of OOS installed

I ran into a problem with my phone the other day. I ended up having the use the MsmDownloadToolV4.0InternationalVersionOxygenOS5.1.5 to restore to stock. After updating to 9.0.9, I kept having trouble installing TWRP. After messing with it for days, I discovered that though I have 9.0.9 installed on my phone, if I switch slots, I have 10 installed on that slot. I'm thinking that when I'm installing TWRP, it's having a problem because I have two different version installed on the phone. Is that possible? Some of the guides I've seen indicate that when you boot to TWRP, then flash it through recovery, it somehow flashes both slots. If that's the case, it would only be the right version of TWRP for one slot, not the other. I'm so confused.
I'm trying to get both slots to be 10 so I can try OmniROM or LineageOS. But at this point, I'd be happy if I could get twrp installed and my phone rooted. I've literally been trying to get TWRP installed for three days straight. It fails every time.

Try to flash OOS 10 with this tool https://forum.xda-developers.com/oneplus-6/how-to/rom-stock-fastboot-roms-oneplus-6-t3796665
You can save your data by removing the "-w" from the bat file when flashing it but try the tool and it should install empty both slots and install OOS 10.

Xenomorphs said:
Try to flash OOS 10 with this tool https://forum.xda-developers.com/oneplus-6/how-to/rom-stock-fastboot-roms-oneplus-6-t3796665
You can save your data by removing the "-w" from the bat file when flashing it but try the tool and it should install empty both slots and install OOS 10.
Click to expand...
Click to collapse
Thank you. I'll try that. I've already lost my data. Luckily, I made a backup not long before this.

Well, that worked, but.....
When I switched over to the other slot, that would no longer boot. Both slots did boot correctly right before I ran flash-all.bat. After doing that, the second one just sat on the spinning boot logo. I don't understand why what I do on slot B should impact what's going on with slot A.

Yippee38 said:
Well, that worked, but.....
When I switched over to the other slot, that would no longer boot. Both slots did boot correctly right before I ran flash-all.bat. After doing that, the second one just sat on the spinning boot logo. I don't understand why what I do on slot B should impact what's going on with slot A.
Click to expand...
Click to collapse
Did you try the flasher with "-w" or without? Also, see if you can uninstall magisk from your phone. And try to go into stock recovery mode and resetting the system data and stuff. (not your data)

Why does my device decide to change boot slots from a to b and back at random, preventing lineage starting?

CLEAN install from latest factory, locked and everything, latest lineage nightly.
I installed lineage and then rebooted recovery and installed addons like the guide says.
But every time I restart it's a 50/50 flip if it will try to boot slot a or b, and b won't boot, just lineage logo forever, I have to ADB change it or just restart the phone enough times to fix it.
Pulling my hair out trying to fix this for months.
ANYONE please?
Thank you.

Correct me if I'm wrong, but I think when there's a failed boot, it will fall-back onto the other boot slot.

paradoxiumwind said:
But every time I restart it's a 50/50 flip if it will try to boot slot a or b, and b won't boot, just lineage logo forever, I have to ADB change it or just restart the phone enough times to fix it.
Click to expand...
Click to collapse
Did you flash boot.img twice ("fastboot flash boot_A" AND "fastboot flash boot_B")?