Install LineageOS on an Android 12 device? - Google Pixel 4a Questions & Answers

My Pixel 4a is currently running the Android 12 beta. I understand that if I install LineageOS, it would go back to being based on A11, as there is no A12 LineageOS yet. However, am I able to go straight from A12 to Lineage, or do I need to flash stock A11 and from there install Lineage?

The safest choice is probably flashing back to stock A11 before installing lineage.

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From OOS 10.0.1 trying to install LOS 16.0 as a beginner and failing completely

I'm trying to install LOS 16.0 but it just won't work. I've tried using the TWRP 3.3.1-16 Q Unofficial by mauronofrio and it works that I can get into TWRP and can flash the rom and GApps, but then after that process once I try to boot into the OS it is just forever stuck in either fastboot or stuck on the bootloader unlocked warning screen. I did realize that I had to use fastboot flash boot twrp*.img because they disabled fastboot boot twrp*.img in the Android 10 update, but then am I supposed to reflash something on that boot partition now? The whole process is very confusing and the instructions from the LineageOS seem to not work at all. Is there anything I can do right now or is it just not possible to install this until TWRP, or OOS, or something I'm not knowledgeable enough to know about updates?
It's because you are using OOS 10.1 as a base (android 10) and you are trying to install Lineage OS 16 (android 9), so it's quite obvious why it isn't working. Try lineage OS 17 instead.
TheSproker said:
It's because you are using OOS 10.1 as a base (android 10) and you are trying to install Lineage OS 16 (android 9), so it's quite obvious why it isn't working. Try lineage OS 17 instead.
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Lineage OS 17 won't work either. The developer intentionally used OOS 9 as base since fastboot boot command doesn't work yet on OOS 10. OP needs to downgrade to OOS 9 first, whichever of the two Lineage OS versions they wish to use.
remewer said:
Lineage OS 17 won't work either. The developer intentionally used OOS 9 as base since fastboot boot command doesn't work yet on OOS 10. OP needs to downgrade to OOS 9 first, whichever of the two Lineage OS versions they wish to use.
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Click to collapse
I tried this. I downgraded to 9.0.9 and still the fastboot boot command is not working. Apparently this has something to do with the bootloader image itself not being downgraded?
I give up now, my temp phone I was using for holding backups for chat data just randomly wiped itself on havocOS and I've just lost years of chats and stuff and it's got me really down right now. They did fix the fastboot boot issue with today's 10.3.0 update but still nothing is working from any tutorial to get this thing to work on lineage, it just won't boot to it and twrp keeps having errors during flashing. This used to be so much easier on my older phones and I've installed this OS on about 5 phones now but OnePlus 6 just doesn't seem to work no matter what. I'm just going to go back to OOS and hope LineageOS 17.0 will get these issues ironed out by the time it releases. Severely disappointing and a waste of 3 days now but oh well
In my opinion, this is the easiest way to downgrade everything to OOS 9, including bootloader https://forum.xda-developers.com/oneplus-6/how-to/op6-collection-unbrick-tools-t3914109
After that, just unlock the bootloader again like usual and follow the LOS16/17 page's install instructions and you should be good to go.
I tried to install Havoc 3.5 while i was on 10 Ob2, unlocked bootloader and installed patched twrp, then rom. Got stuck in fastboot mode. **** hell i messed everything, later i found fastboot recovery rom from xda, flashed it, thank god it saved me. For me, msm tool was not getting connected, got an error like sahara xyz something... Then after refering to multiple xda threads came to know that most of the present 10 custom roms are based on oos android 9. Then again i used downgrade package from community, reverted back to ob 25 oos (pie), then as usual installation process. So if you are interested in custom roms, downgrade to pie. And again i wanted to go back to complete stock from havoc but unfortunately msm was not responding and fastboot roms wont support upgradation (im not sure), i went to twrp and installed stable 9.0.9 to both partitions + twrp installer. Then 10 oos stable to both partitions + twrp. Then booted up and installed Ob2 again from system updater, lost twrp on that process, then locked bootloader, so mow completely stock ? lot of work for nothing ? oos is better for me.. infact i got used to that. maybe i should purchase another phone to continue the momentum of getting latest updates. crazy oos influence ?

GSI ROM Problem on Samsung Sm-M105F

Hi Everyone,
I have Samsung Galaxy SM-M105F and did these following things to install GSI Havoc Rom:
1.Installed TWRP from Surbiks(from M10 threads)
2.Installed Havoc Os 9.0 (Official) via TWRP but it said that encryption unsuccessful error.Tried factory reset. but still it won't work and it backed to encryption unsuccessful screen.
So i reverted to stock Android One UI 1.0 (AV-9.0)
But i want to install GSI like pixel exprience now on my phone because i dont like my stock firmware.
If i try to install this will it be like the same as before?
How to install it properly? It will be very helpful.

Cannot Install Lineage OS 18.1 (Nightly Jan 11th 2022) using the official installation method from Lineage WIki

I'm on Stock OOS 11 with all the latest firmware installed and no more updates from oneplus.
So I tried to flash lineage os 18.1 on my Oneplus 6 (enchilada).
I followed every step, unlock bootloader, flash lineage recovery to boot and use lineage recovery to copy partitions and install lineage os
and open gapps.
But when I reboot finally I get stuck in the Lineage OS boot animation. Can't get past that even after 2+ hours. Tried to reflash many times
with the same procedure.
Finally I gave up and used MSM Download Tool to get back to stock OOS 10 and then updated again to the latest version of OOS from oneplus.
Now what should I do different, to install Lineage OS 18.1 in my oneplus 6(enchilada)?
SOLVED:
The latest nightly has a major bug hopefully the future release may fix it. Until then use 220104 nightly and don't update through OTA.
Wait until next build comes with the reverted commit.
Revert "adbconnection: don't spin if adbd isn't running." Breaks boot for many devices.

Question How to Downgrade from Android 12 to 11? (ArrowOs)

I am on ArrowOS 12, and I would like to return to ArrowOS 11, because after a while with Android 12, I was not completely convinced, and especially that I had some features in ArrowOS 11 that I do not have in ArrowOS 12.
I really don't know the exact steps to do it safely and I can't find any tutorials about it.
Previously I was on ArrowOS 11, and I did a dirty flash of ArrowOS 12, to upgrade.
chavaa said:
I am on ArrowOS 12, and I would like to return to ArrowOS 11, because after a while with Android 12, I was not completely convinced, and especially that I had some features in ArrowOS 11 that I do not have in ArrowOS 12.
I really don't know the exact steps to do it safely and I can't find any tutorials about it.
Previously I was on ArrowOS 11, and I did a dirty flash of ArrowOS 12, to upgrade.
Click to expand...
Click to collapse
A12 data is lot differant from A11 data, so if you dirty flash you will have a boot loop
you have to clean flash the rom

Won't boot to system after android 12 gsi flash

I flashed Pixel Experience 13 GSI with no faults but unfortunately as it's still in pre-release it has some issues and bluetooth didn't work for me so I tried to flash the Android 12 PE GSI again but now for some reason won't boot to recovery, if I flash the Android 13 version again it works fine and so does any Android 13 GSI but Android 12 GSI's will only boot to recovery, there are no error messages during fastboot flash, any suggestions are appreciated and I can provide any logs needed just let me know what is required.
Just to clarify I was already running the android 12 version of Pixel Experience before this
Re-flash Stock ROM.

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