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The correct way to install OOS or Custom ROMs

Hello everyone, Ive seen this instruccions to flash oos and some custom roms
1. wipe everything except internal
2. flash oos then twrp
3. reboot TWRP
4. flash magisk
5. reboot system
my problem is that following that instruccions my phone reboot to TWRP, not system.
So i had to omit flash Magisk to boot system, My procedure is
1. wipe everything except internal
2. flash oos then twrp
3. reboot TWRP
4 reboot system, complete setup
5. flash magisk
i dont know if im doing something wrong
does it happen that to you?
PD: sorry if my english is bad

After you having installed any AOSP-based rom, and then want to go back to OOS, You may meet encryption problem.
The only way I have known is to format /data(This will delete all data stored on your phone)
Or set your screen lock method to 'none' before you flash any other rom(maybe,i have not tried it)

1. wipe everything except internal
2. flash C'ROM then twrp-installer.zip
3. reboot TWRP
4. flash Gapps & magisk
5. reboot system

SuzutsukiKaede said:
After you having installed any AOSP-based rom, and then want to go back to OOS, You may meet encryption problem.
The only way I have known is to format /data(This will delete all data stored on your phone)
Or set your screen lock method to 'none' before you flash any other rom(maybe,i have not tried it)
Click to expand...
Click to collapse
This has been fix. You can now put your phone pin code. I used latest twrp. Check your version.

i cant boot system when i flashed magisk (any version of magisk)

Fresh install from scratch - 9.0.3

Dear friends:
I have Op6 with 9.0.3 + unlocked + Magisk + xXx rom last version.
I feel its time backup my data and re-install a clean rom. On old days i woul go TWRP, erase system and data, and reinstall rom.
With OP6 i just freeze to think that i can brick this "lady".....
Question:
How to clean my phone and reinstall 9.0.3, step by step for newbie, preference using TWRP Blue?
I feel many users also want to do it.
Appreciate it.

Maybe i didnt make myself clear:
How to re-install 9.0.3, like it was when i buy the phone?

msm tool

Thanks for the reply.
As far i know thats for recovery brick telephone...
Can´t i use options on TWRP for the same?

Use the fastboot 9.0.3 method via command prompt/powershell. If you want stock recovery do nothing further. This will wipe the entire device.
If you want root, then flash bluspark TWRP recovery img from ADB. From there, reboot to that img of twrp, flash actual bluspark twrp recovery zip and reboot into recovery. From there, flash Magisk if you want root, or any other roms/kernels, etc.
https://forum.xda-developers.com/oneplus-6/how-to/rom-stock-fastboot-roms-oneplus-6-t3796665

You could flash Blu_Spark TWRP, flash the 9.0.3 full ROM via this, an then Format Data. This will totally wipe the phone and remove enrcryption, so it won't bother you with the downgrade.
This is the more effective way ! At least, faster than fastboot.
Edit : Oh, you're already on 9.0.3 ! In this case just do as you said in the OP, Blu_Spark TWRP, flash the full 9.0.3 zip, Factory Reset. No need to wipe System though.
If you want it to be very clean, do it twice to fill both slots. Don't forget to reflash TWRP after the ROM though, or it will erase it in favor of the OnePlus recovery, and you won't be able to flash it a second time.
If you want it to be very very very clean, like "out of the box" clean, you can still Format Data after those two flashs (Not before, or your zips will be deleted before you used them and you'll cry a little).

Ah....that what i want ear....
Merci beaucoup pour láide..

100% proper way to install roms?

Hi
In every rom thread I see about a million different answers on how to properly install the rom. Usually the official instructions are very vague. I've been flashing roms for years but this ab partition is very confusing to me. I just got my oneplus 6 a few days ago. It would be great if someone very knowledgeable in how to do this could make a how to guide for both stock and custom roms. I think it would really help everyone and threads for each rom wouldn't be full of people asking it over and over (and getting different answers). Thank you devs for all that you do.

Custom if you don't know if you have the recommend base installed to both slots:
Flash OOS
Flash twrp
Reboot to twrp
Flash OOS
Flash twrp
Reboot to twrp
Wipe data, dalvik cache
Flash custom
Flash twrp
Reboot to twrp
Flash gapps
Flash magisk
Boot system
Custom update:
Flash updated custom rom
Flash twrp
Reboot to twrp
Flash gapps (not needed, but updated gapps is most likely better to use anyhow..)
Flash magisk.
From custom back to OOS:
Info: Format data needed because you will trigger encryptionsince you're on different securety patch. This is also the same way to go from beta branch of oos to stable since the securety patches is lower (in general) on stable.
How to:
Boot twrp
Plug phone in to pc and take backup of everything
When done format data
Transfer oos, twrp, magisk to phone
Flash oos
Flash twrp
Reboot to twrp
Flash magisk
Update oos from... Let's say 9.0.4 to 9.0.5
From Twrp:
Flash oos
Flash twrp
Reboot to twrp
Flash magisk
Boot
From oos:
Use ota update, let it install until it asks you to reboot.. DON'T DO IT.
instead go to magisk and search for "a/b" one module will be found, install it. DON'T REBOOT
Go to main screen of magisk and press install, install, install to inactive slot (after ota) when it's done you can reboot.
General ****ups:
Don't boot after update?
Flash magisk uninstaller
Try to boot (yes.. Without magisk)
If it boots you know it was magisk issue, most likely you had substratum overlays installed or modules that messed it up.
Reboot to twrp and flash magisk again and set up your modules one by one or apply themes or whatever you do with your root.

Recovery Bootlooop Please Help *Urgent*

I decided to root my Oneplus 6 (10.30.1) yesterday and everything went fine using TWRP 3.3.1.17 mauronofrio and Magisk 20.3.
Today I wanted to installed EdXposed which I did by going in to Magisk Manager, install Riru, reboot, install EdXposed and then reboot.
However, after installing EdXposed my phone would not boot, it would just hang on the loading screen.
I forced a reboot in to TWRP recovery and proceeded to restore my nandroid backup. This only made things worse.
When i try to boot I get the unlocked bootloader warning, it tries to boot in to the OS for about one second, then back to the bootloader warning screen and so on and so on.
I can still boot in to TWRP with Vol down + Power and i've tried wiping data and i've tried 'fix recovery bootloop' in the advanced settings but neither has worked.
Could someone kindly help fix this? I dont mind if i have to reinstall a stock Rom and lose root etc. I just want my phone back
Thanks

Goooober said:
I decided to root my Oneplus 6 (10.30.1) yesterday and everything went fine using TWRP 3.3.1.17 mauronofrio and Magisk 20.3.
Today I wanted to installed EdXposed which I did by going in to Magisk Manager, install Riru, reboot, install EdXposed and then reboot.
However, after installing EdXposed my phone would not boot, it would just hang on the loading screen.
I forced a reboot in to TWRP recovery and proceeded to restore my nandroid backup. This only made things worse.
When i try to boot I get the unlocked bootloader warning, it tries to boot in to the OS for about one second, then back to the bootloader warning screen and so on and so on.
I can still boot in to TWRP with Vol down + Power and i've tried wiping data and i've tried 'fix recovery bootloop' in the advanced settings but neither has worked.
Could someone kindly help fix this? I dont mind if i have to reinstall a stock Rom and lose root etc. I just want my phone back
Thanks
Click to expand...
Click to collapse
Use the msm tool to recover your device...

Try booting into the mauronofrio twrp recovery from fastboot. Then wipe the system partition and reinstall your rom.
Then boot mauronofrio twrp again from fastboot and install the zip, and reboot to recovery.
Install custom kernel, Magisk.

Uninstall edexposed

People reply here with no clue and advise to just restore stock. How is this a solution and how did not OP think of it themselves?
This is too little too late, but maybe it helps someone else:
Unofficial TWRP for Android 10 is glitchy. E.g. nanodroid backups are not restoring properly. Given current A/B mess this is not at all surprising.
Solution: wipe everything, reinstall *same* lineageOS version as before, flash same gapps as you had, and if you took the nanodroid backup after magisk, install it as well.
Don't boot yet!
Restore the backup *partially*, e.g. only the data partition.
This should work.
Or, emh, it did for me with some minor glitches. But even Google Authenticator didn't notice spoofing (otherwise RIP my accounts). So, i definitely recommend trying this workaround.

Android 10 & Custom ROM & Slot A + B

Hello Android developers and enthusiasts,
I've been installing ROM since 2011 so I would not call myself a n00b however I seemingly cannot install an Android 10 ROM without issues. So this is a plea for help and advice!
I know you need to have OOS installed before you install a custom ROM so I use Auto Flash ROM to install OOS with Android 9 via System Update. I then boot and set up phone, install update, reboot and then install the OOS android 10 via the System Update. I then have a OOS installed with Android 10.
Why would I use such an elaborate method you may ask? Well, I tried to download latest OOS from OnePlus site and wipe phone and then install OOS but that fails (didn't record the error I'm afraid).
I then download all the ROM + dependencies on an USB stick and use fastboot to flash Mauronofrio TWRP. I then follow the steps in the ROM instructions. For EvolutionX these were:
First Time Install / Clean Flash
- Have OOS 10.3 flashed to both slots!!
- Boot to recovery
- Flash BUILD.zip (TWRP built-in)
- Wipe Cache
- Format data
- Reboot to recovery (optional)
- Flash Magisk.zip (optional)
- Reboot to system & #KeepEvolving
Click to expand...
Click to collapse
I followed these to the letter but when i rebooted system I got a snapdragon error and it wouldn't even boot into TWRP until I used fastboot to flash boot into TWRP. I also tried HavocROM and same happened.
I did manage to install Syberia using above method but I didn't like the ROM that much unfortunately.
Finally, I've also read up a lot on Slot A and B but it still is not very clear to me. I think I understand it but what happens does not confirm my theories
I therefore have some questions:
- Should I be able to wipe my phone and install OOS on a wiped phone and then install a custom ROM?
- When I install ROM and it says "Reboot Recovery" and then install ROM again. But if I check what slot is being used the reboot doesn't seem to change the slot. My assumption was that booting recovery was to install ROM in the other slot. Is that correct?
Any other tips you can give me?
Again, I like to stress I am not new to installing custom ROMs so I am a bit disappointed that this is causing me such grief.
Following some answers I will retry tomorrow so I can give some more details if needed. For now, appreciate any help.

roel1976 said:
Hello Android developers and enthusiasts,
I've been installing ROM since 2011 so I would not call myself a n00b however I seemingly cannot install an Android 10 ROM without issues. So this is a plea for help and advice!
I know you need to have OOS installed before you install a custom ROM so I use Auto Flash ROM to install OOS with Android 9 via System Update. I then boot and set up phone, install update, reboot and then install the OOS android 10 via the System Update. I then have a OOS installed with Android 10.
Why would I use such an elaborate method you may ask? Well, I tried to download latest OOS from OnePlus site and wipe phone and then install OOS but that fails (didn't record the error I'm afraid).
I then download all the ROM + dependencies on an USB stick and use fastboot to flash Mauronofrio TWRP. I then follow the steps in the ROM instructions. For EvolutionX these were:
I followed these to the letter but when i rebooted system I got a snapdragon error and it wouldn't even boot into TWRP until I used fastboot to flash boot into TWRP. I also tried HavocROM and same happened.
I did manage to install Syberia using above method but I didn't like the ROM that much unfortunately.
Finally, I've also read up a lot on Slot A and B but it still is not very clear to me. I think I understand it but what happens does not confirm my theories
I therefore have some questions:
- Should I be able to wipe my phone and install OOS on a wiped phone and then install a custom ROM?
- When I install ROM and it says "Reboot Recovery" and then install ROM again. But if I check what slot is being used the reboot doesn't seem to change the slot. My assumption was that booting recovery was to install ROM in the other slot. Is that correct?
Any other tips you can give me?
Again, I like to stress I am not new to installing custom ROMs so I am a bit disappointed that this is causing me such grief.
Following some answers I will retry tomorrow so I can give some more details if needed. For now, appreciate any help.
Click to expand...
Click to collapse
Hi!
I had this exact same problem a couple months ago. Rebooting to recovery used to change slots for me, but then it stopped.
What you can do is change active slot manually on Reboot section. By doing this, you don't even have to reboot to recovery in other to flash the other slot (altough I do it just to be safe).
And remember: the rom is flashed on the inactive slot, so after the final flash you gotta change slots one more time.

When you flash one ROM on top of another different ROM, particularly OOS to custom, always wipe data and not format data, because some custom ROMs do not support being unencrypted in the first time and then encrypt on the first boot. So do it like this:
Flash OOS
Flash TWRP
Reboot recovery
Flash OOS
Flash TWRP
Reboot system
Complete initial setup
Reboot to recovery
Wipe (not format) data
Flash custom ROM (start here for dirty flashing ROM update)
Flash TWRP
Reboot recovery
Flash custom ROM
Flash TWRP
Reboot recovery
Flash Magisk
Reboot system
I don't like built-in TWRP in custom ROMs. I always use @mauronofrio's TWRP. So regardless if the custom ROM I'm using has TWRP built-in or not, I always use the method above. I didn't have a problem with installing ROMs using his TWRP. Slots always switch when flashing ROM.

Thanks for the info, it really helps.
One question: in your experience can you wipe your phone and then installl OOS on the wiped phone?

So I just booted into TWRP, did standard wipe action: Data, Cache, and Dalvik. I then try to flash the latest OOS zip and I then get this error:
Error applying update: 7 (ErrorCode::kInstallDeviceOpenError)
Updater process ended withL ERROR: 1.
Error installing zip file: '/usbstorage/00, INSTALL/OnePlus6Oxygen_22_OTA_044_all_2002220042_a46425f1bfe43d2.zip
FIXED: I was using TWRP 3.3.1.11 and I then found out there was a newer version: 3.3.1.18 which you can get here: https://sourceforge.net/projects/mauronofrio-twrp/files/Enchilada/
I am now able to install OOS from scratch (ie wiped phone).

remewer said:
When you flash one ROM on top of another different ROM, particularly OOS to custom, always wipe data and not format data, because some custom ROMs do not support being unencrypted in the first time and then encrypt on the first boot. So do it like this:
Flash OOS
Flash TWRP
Reboot recovery
Flash OOS
Flash TWRP
Reboot system
Complete initial setup
Reboot to recovery
Wipe (not format) data
Flash custom ROM (start here for dirty flashing ROM update)
Flash TWRP
Reboot recovery
Flash custom ROM
Flash TWRP
Reboot recovery
Flash Magisk
Reboot system
I don't like built-in TWRP in custom ROMs. I always use @mauronofrio's TWRP. So regardless if the custom ROM I'm using has TWRP built-in or not, I always use the method above. I didn't have a problem with installing ROMs using his TWRP. Slots always switch when flashing ROM.
Click to expand...
Click to collapse
I tried this method and everytime I can't seem to flash oos onto the other slot because when it reboots to recovery the folder is encrypted so I can't see which file is the zip. How do I flash the seccond OOS if it shows up encrypted in TWRP.
I have a OnePLus 6 with the latest OOS now because I got into boot loop and i used a flash-all.bat to get back to stock. I also use maronofrio's twrp because that works.

harshybar said:
I tried this method and everytime I can't seem to flash oos onto the other slot because when it reboots to recovery the folder is encrypted so I can't see which file is the zip. How do I flash the seccond OOS if it shows up encrypted in TWRP.
I have a OnePLus 6 with the latest OOS now because I got into boot loop and i used a flash-all.bat to get back to stock. I also use maronofrio's twrp because that works.
Click to expand...
Click to collapse
If you can boot OOS fine, try to do a local update so that both slots have OOS. Then try to flash a custom ROM again using the method I've mentioned.

remewer said:
If you can boot OOS fine, try to do a local update so that both slots have OOS. Then try to flash a custom ROM again using the method I've mentioned.
Click to expand...
Click to collapse
When you say local update you mean while I am running the rom, go to settings then do update from local source?

harshybar said:
When you say local update you mean while I am running the rom, go to settings then do update from local source?
Click to expand...
Click to collapse
Exactly

GuestD2559 said:
When you flash one ROM on top of another different ROM, particularly OOS to custom, always wipe data and not format data, because some custom ROMs do not support being unencrypted in the first time and then encrypt on the first boot. So do it like this:
Flash OOS
Flash TWRP
Reboot recovery
Flash OOS
Flash TWRP
Reboot system
Complete initial setup
Reboot to recovery
Wipe (not format) data
Flash custom ROM (start here for dirty flashing ROM update)
Flash TWRP
Reboot recovery
Flash custom ROM
Flash TWRP
Reboot recovery
Flash Magisk
Reboot system
I don't like built-in TWRP in custom ROMs. I always use @mauronofrio's TWRP. So regardless if the custom ROM I'm using has TWRP built-in or not, I always use the method above. I didn't have a problem with installing ROMs using his TWRP. Slots always switch when flashing ROM.
Click to expand...
Click to collapse
@Cypher_01, Try this guide. This worked for me. I did not reinstall Nikgapps. Maybe that's where the problem lies? Don't forget to change the update slot at the end before you restart.​