Phone stuck in bootloop after LineageOS update - OnePlus 7 Pro Questions & Answers

Yesterday I got the notification to update LineageOS, so I downloaded the update through the Installer application, and rebooted the phone when prompted. After this it started bootlooping and I couldn't get into the system.
Since I don't want to lose the data on the phone, I tried reflashing the latest rom and older versions through TWRP, including the one I first installed, but after flashing it still loops. I had Magisk installed so I removed it but that didn't help. When I reflashed the rom, I also flashed the 'copy_partitions.zip' in the lineageos install instructions still to no avail.
I also tried the method here but the wipe option does not display the system option, so it didn't work.
Any help?

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Phone bootlooping if i update to CM12, working with CM11S and ColorOS

Hi everyone, i've got my OPO when CM12 still wasn't a thing, and it always did his job wonderfully, i've updated to CM12 when it first came out, then updated it every time a new stable version was out, YNG1TAS2I3 version included (with root access and TWRP). A few days ago, while i was listening to some music with Google Play Music, the phone started to reboot itself for no apparent reason, and after around 10 reboots with random timings, i found out there was a problem with google play services, so i blocked them with Titanium Backup, deleted updates, updated them again, reactivated, and everything went fine.
Yesterday, my phone once again rebooted by itself, but every time it was rebooting, while showing the boot logo, it rebooted again without actually loading android. I first tried to wipe cache, then dalvik cache, then data and system partitions, factory reset, but it kept rebooting no matter what, until i tried to flash CM11S on it. After a few tries and total wipes, CM11S was running with no reboots, and it worked flawlessly, no root, no custom recovery, everything stock flashed from official fastboot images zip.
After that, i tried to update via OTA to the more recent versions of CM11S, no problems so far, but as soon as i updated to CM12 via OTA once again, the phone started to reboot itself after the update, it says "Upgrading Android" like when you wipe the dalvik-cache, and then it freezes for a second, then reboots.
Things i've tried so far:
full wipe and factory reset from TWRP
erase and flash again all partitions
erase and flash again persist partition
flash colorOS and then flash CM12
After flashing the persist partition it managed to work for a minute on CM12, but then it started rebooting itself again, and i've managed to save the last part of logat log , but i'm not sure if it's worth anything to find out the problem! (i can't post it on forum because of the new user link restriction, but if you want to have a look at it, let me know)
So, basically, my phone works only on android 4.x and not on 5.x, I would think some app on it can make it crash, but even after a full wipe it still behaves like this, what could be the reason and how can i try to fix it? thanks in advice!
I recommend you to flash fastboot images of CMOS12 without skipping any file
Steps to flash >> http://forum.xda-developers.com/oneplus-one/general/guides-bacon-timmaaas-how-to-guides-t2839471
xKylesx said:
Hi everyone, i've got my OPO when CM12 still wasn't a thing, and it always did his job wonderfully, i've updated to CM12 when it first came out, then updated it every time a new stable version was out, YNG1TAS2I3 version included (with root access and TWRP). A few days ago, while i was listening to some music with Google Play Music, the phone started to reboot itself for no apparent reason, and after around 10 reboots with random timings, i found out there was a problem with google play services, so i blocked them with Titanium Backup, deleted updates, updated them again, reactivated, and everything went fine.
Yesterday, my phone once again rebooted by itself, but every time it was rebooting, while showing the boot logo, it rebooted again without actually loading android. I first tried to wipe cache, then dalvik cache, then data and system partitions, factory reset, but it kept rebooting no matter what, until i tried to flash CM11S on it. After a few tries and total wipes, CM11S was running with no reboots, and it worked flawlessly, no root, no custom recovery, everything stock flashed from official fastboot images zip.
After that, i tried to update via OTA to the more recent versions of CM11S, no problems so far, but as soon as i updated to CM12 via OTA once again, the phone started to reboot itself after the update, it says "Upgrading Android" like when you wipe the dalvik-cache, and then it freezes for a second, then reboots.
Things i've tried so far:
full wipe and factory reset from TWRP
erase and flash again all partitions
erase and flash again persist partition
flash colorOS and then flash CM12
After flashing the persist partition it managed to work for a minute on CM12, but then it started rebooting itself again, and i've managed to save the last part of logat log , but i'm not sure if it's worth anything to find out the problem! (i can't post it on forum because of the new user link restriction, but if you want to have a look at it, let me know)
So, basically, my phone works only on android 4.x and not on 5.x, I would think some app on it can make it crash, but even after a full wipe it still behaves like this, what could be the reason and how can i try to fix it? thanks in advice!
Click to expand...
Click to collapse
1)Are u tried cm 12.1
after u flashing cm 12 then reboot and again go back to recovery and flash cm 12.1
2) try to use different kernels supporting to cm 12 like boeffla /AK etc
3) try to flash cm 12 firmware via fastboot flash installation process

Issues flashing CM13. Phone keeps rebooting once it gets to CM splash screen

Ok... slightly frustrated here.
Basic issue: Have flashed CM13 (Nightly 5.17.16) along with the latest Gapps. Upon reboot my phone will go to the Cyanagenmod splash screen, appear to load for several seconds, and then restart. It keeps doing this for at least 10 minutes until I turn it off. I have re-flashed a couple times after reloading the backup but no change.
Process I used: First of all my phone already has Android 6.0.1 firmware installed (not sure if that's an issue). I have TWRP setup as recovery and rooted with su 2.52 (and yes I verified the root prior to flashing). To flash I boot into recovery (obviously), factory reset, install cm13, clear dalvik, and repeat process with gapps. I've done this before with older CM's successfully but for some reason I can't get past the CM splash screen.
Any assistance is appreciated. If I have made a completely stupid error in my process or this exact issue is covered in another thread don't hesitate to point that out!!
Thank you in advance.
i was getting the same thing on my 1st flash into 13 from moar rom 7.0 but did some reseach and fixed it by wiping the dalvik and cache before the flash and then installed cm13 and then the gapps 6.0 stock all in twrp and fyi you dont need super su just unlock the developer mode and go to the bottom and turn on root access it made me crash my system after i installed new supersu hope these helps
you dont want to be on a MM baseband. Flash a LP tar.md5 in odin and reinstall CM13

CM13 flashing problems. Phone keeps rebooting at CM splash screen after flash

Ok... slightly frustrated here.
Basic issue: Have flashed CM13 (Nightly 5.17.16) along with the latest Gapps. Upon reboot my phone will go to the Cyanagenmod splash screen, appear to load for several seconds, and then restart. It keeps doing this for at least 10 minutes until I turn it off. I have re-flashed a couple times after reloading the backup but no change.
Process I used: First of all my phone already has Android 6.0.1 firmware installed (not sure if that's an issue). I have TWRP setup as recovery and rooted with su 2.52 (and yes I verified the root prior to flashing). To flash I boot into recovery (obviously), factory reset, install cm13, clear dalvik, and repeat process with gapps. I've done this before with older CM's successfully but for some reason I can't get past the CM splash screen.
Any assistance is appreciated. If I have made a completely stupid error in my process or this exact issue is covered in another thread don't hesitate to point that out!!
Thank you in advance.
You need to be on 5.0 Lollipop. Custom recovery. Rooted. Then flash the ROM after you Wipe in Twrp

Stuck in bootloop after installing gapps

I installed lineage 16 yesterday, worked fine, but while messing around in the menus I found something for an update, I went ahead and applied it, it then proceeded to boot loop on me. It would say can't load android system and would give me a option to try again or factory reset, I tried both, nothing helped. So I tried reinstalling the OS, i boot into twrp, choose the lineage and gapps zip, let it install, and then at the end I clear the cache, it runs through but then pops up in red "unable to find partition for path '/cache'". I then reboot and it then puts me right back at the screen for android recovery. Any suggestions on what I'm doing wrong?
Have you updated to the latest firmware using the instructions in the LOS thread for this phone? Did you forget to reboot between installing LOS and gapps? One of the two if probably your problem

Question Stuck in BootLoop, unable to flash boot.img via TWRP or ADB

Hi, I run LineageOS 19.1 on my Vayu. It is obviously unlocked and I have Rooted it with Magisk.
I have put off updating the System but did it just now through the Updater in the Settings. From 20220916 to 20221104.
I ran into a Bootloop and went into Fastboot, installed TWRP with ADB sideload. (Had stock Recovery before)
I then tried to just revert back to 20220916 (which was not so smart). I tried to sideloaded the boot.img, but it showed "failed".
--> Still in Bootloop after Rebooting
Now I am unable to flash any boot.img or boot at all.
I tried to flash something else (Magisk.zip), which worked. I have removed all magisk modules, tried to boot with
magisk --remove-modules.
Does anyone have any Ideas? I don't really want to Reset my Phone, even though I have abundant Backups.
Thank you )
Moving back to old version almost all the times is not possible without full reset, new version contains new scripts and possibly new files, how would you explain this for system?
By flashing old version over new one, you probably messed up your system, might as well just backup your data and start from scratch.

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