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How to go back from Oxygen to Hydrogen?

Hi
Recently I flashed my OP 7 Pro from Chinese version of Hydrogen to Global Oxygen 9.5.7.
I have Chinese version of the phone GM1910 and I did that mostly because of the Google Services lock [as Google is banned in CN]
Now I would like to go back to the original version, but I don't think that I can do it by the local upgrade [as the H is a higher version than Oxygen?]
Would factory reset bring it back to the Hydrogen version? Or the Oxygen is now the official version of the software for my phone?
Apologies if my question is stupid, but I am really new to all those flashes and changing ROMs, so I rather ask before fragging my lovely phone
thank you for any info

Flash Chinese Full version (latest) from local update then wipe date from recovery.
changing from Hydrogen version to Oxygen or from Oxygen to Hydrogen is easy

just flash it back from local update, no data wipe is needed if it is no error (official instruction), i flash from h2os to oos without wipe, no problem.

anasmhds said:
Flash Chinese Full version (latest) from local update then wipe date from recovery.
changing from Hydrogen version to Oxygen or from Oxygen to Hydrogen is easy
Click to expand...
Click to collapse
simon07 said:
just flash it back from local update, no data wipe is needed if it is no error (official instruction), i flash from h2os to oos without wipe, no problem.
Click to expand...
Click to collapse
Unfortunately it's impossible.
Hydro is a lower version than Oxy, system won't aloud to do it.
I'll have to wait for the next update,or root it..?
So annoying ?
PS: thank you for your input guys

mWatcher said:
Unfortunately it's impossible.
Hydro is a higher version than Oxy, system won't aloud to do it.
I'll have to wait for the next update,or root it..?
So annoying
PS: thank you for your input guys
Click to expand...
Click to collapse
Unlock bootloader and flash it via fastboot ? (provided if there's a fastboot version of the rom)
Local upgrade doesn't allow downgrading firmware. You mentioned that the HOS's version is higher then it shouldn't be a problem right?

JJay666 said:
Unlock bootloader and flash it via fastboot ? (provided if there's a fastboot version of the rom)
Local upgrade doesn't allow downgrading firmware. You mentioned that the HOS's version is higher then it shouldn't be a problem right?
Click to expand...
Click to collapse
Sorry it's the other way around.
I can't do it over local upgrade.
What's the difference between official ROM and fastboot version? (Sorry I'm still learning here) :crying:

mWatcher said:
Sorry it's the other way around.
I can't do it over local upgrade.
What's the difference between official ROM and fastboot version? (Sorry I'm still learning here) :crying:
Click to expand...
Click to collapse
Official one is flashable via local upgrade, fastboot rom is executed via fastboot mode adb.

mWatcher said:
Unfortunately it's impossible.
Hydro is a lower version than Oxy, system won't aloud to do it.
I'll have to wait for the next update,or root it..?
So annoying
PS: thank you for your input guys
Click to expand...
Click to collapse
Waite few days to get OTA_010 of Hos

Use MSMdownloadtool. There is one for the Chinese phone. it's in the thread collecting all the various MSMdownloadtool archives. Use that to get down to an old version of Hydrogen, then you can flash Oxygen via local update.

DTop said:
Use MSMdownloadtool. There is one for the Chinese phone. it's in the thread collecting all the various MSMdownloadtool archives. Use that to get down to an old version of Hydrogen, then you can flash Oxygen via local update.
Click to expand...
Click to collapse
Cheers
I'll try it tonight

mWatcher said:
Cheers
I'll try it tonight
Click to expand...
Click to collapse
fyi, going through same thing now. delete the chinese text from the first folder or copy the guac folder elsewhere. it errors otherwise. took me ages to figure it out.

If that doesn't work for some reason, I'm surprised nobody mentioned using TWRP to flash Hydrogen. If that doesn't work for you, try installing TWRP and then flashing Hydrogen that way. ?

Oneplus7pro back to stock

Hello there,
I tried the open beta on the OnePlus 7pro for a while, but I have some massive issues with speaker distortion, so I decided to go back to stock. I know this involves a wipe of the entire system, and I have fully prepared that.
However: I seem to be to stupid to perform this. I used to flash all kinds of roms to my OP3 back in the day, but I can't find an option for simply flashing the zip in the recovery.
My big big question is: How do I perform the full reflash of this phone?
Do I get an factory rom like with the pixel, or do I need to sideload something and flash it in recovery?
I am really clueless rightnow, expecially since the factory image told me, that the bootloader is locked, but to my unterstandig, flashing an original manufacturer image should not require the bootloader to be unlocked...
So I am really hoping on your help, as rightnow, I have a beta phone that is waiting to be setup...
:crying:

Follow this tutorial.
https://forum.xda-developers.com/oneplus-7-pro/how-to/msm-tool-guac-t3934691

Or easier way would be to download rollback package from oneplus which will wipe everything on your phone. You will have os9.5.3
You can then do Ota upgrade to latest os version. Rollback package is listed in in the middle of the post
https://forums.oneplus.com/threads/...-for-the-oneplus-7-and-oneplus-7-pro.1099154/

So my OnePlus 7 Pro is rooted, has twrp, xxx ROM and renovate ice. If I want to go back stock and relock bootloader, can I simply flash the latest ROM (in this way I should loose twrp and root) and then relock bootloader with ADB command?

Jack_Sparrow_ said:
So my OnePlus 7 Pro is rooted, has twrp, xxx ROM and renovate ice. If I want to go back stock and relock bootloader, can I simply flash the latest ROM (in this way I should loose twrp and root) and then relock bootloader with ADB command?
Click to expand...
Click to collapse
I'd just use the MSMtool detailed here: https://forum.xda-developers.com/oneplus-7-pro/how-to/op7pro-collection-unbrick-tools-t3956595

jdgesmlls said:
I'd just use the MSMtool detailed here: https://forum.xda-developers.com/oneplus-7-pro/how-to/op7pro-collection-unbrick-tools-t3956595
Click to expand...
Click to collapse
That's what I did eventually, faster and easier

jdgesmlls said:
I'd just use the MSMtool detailed here: https://forum.xda-developers.com/oneplus-7-pro/how-to/op7pro-collection-unbrick-tools-t3956595
Click to expand...
Click to collapse
Bro.. I'm on 10.3.4 i just want to go complete stock. The msm tool version seems older? Or can I use the older one or use that roll back rom to go to 9.5.3 and ota update to latest version?

RANJITH THRISSUR said:
Bro.. I'm on 10.3.4 i just want to go complete stock. The msm tool version seems older? Or can I use the older one or use that roll back rom to go to 9.5.3 and ota update to latest version?
Click to expand...
Click to collapse
There is a newer one available search for unbrick tools in forums and also you can use this old one too you have to do local upgrade after that

muhammadshais said:
There is a newer one available search for unbrick tools in forums and also you can use this old one too you have to do local upgrade after that
Click to expand...
Click to collapse
Thanks bro!!
Local upgrade is a cake walk! All my worry was, if I go for a random version msm tool, which is not specific to 10.3.4(more like the case of fast boot Roms), i may stuck at bootloop/something undesirable.
From your reply, i understand, i can use any msm tool zip that supports one plus 7 pro, and get back to stock with an older oos version in it. From there i can choose OTA upgrade or local upgrade.. Whichever way? Right ?

RANJITH THRISSUR said:
Thanks bro!!
Local upgrade is a cake walk! All my worry was, if I go for a random version msm tool, which is not specific to 10.3.4(more like the case of fast boot Roms), i may stuck at bootloop/something undesirable.
From your reply, i understand, i can use any msm tool zip that supports one plus 7 pro, and get back to stock with an older oos version in it. From there i can choose OTA upgrade or local upgrade.. Whichever way? Right ?
Click to expand...
Click to collapse
Yes I used 9.3.4 and then did local update but if you are on 9.3.4 you have to flash first 10.0.3 and then after that 10.3.4 to upgrade.

Question Downgrade LE2115 from 12 to 11 - confused.

Hello all,
My phone came with ColorOS OOS 12 and I hate it. As soon as I rooted it it started crashing daily, I even reflashed a fresh oos12 image using the local update tool and only granted superuser to one app (solid explorer so I could access user files) and it still crashes. Not to mention all the apps i want to use don't work on android 12 (call recorder, busy box) and no custom recovery.
I've been reading through the forum and I found a downgrade package that looks like its hosted by oneplus: https://oxygenos.oneplus.net/OnePlu...all_2107082125_downgrade_059624cc7298428b.zip
I just wanted to make sure I am doing this correctly...
Do I use the OP Local Update app to flash?
Will I be able to flash TWRP for android 11 afterwards?
Will i need to relock the bootloader?
Should i re-root using the magisk slot b method or wait until its flashed and use TWRP?
Will it try to OTA back to android 12? If so, what's the best method to get on the latest version of android 11?
Thanks for the help.

I am running COS C.62 on my OP9 with root and having no issues. Did you make sure to do all the things in this guide?
Root OnePlus ColorOS 12 OxygenOS Android 12 via Magisk
In this tutorial, we will show you detailed steps to root your OnePlus device running ColorOS 12 Android 12 via Magisk Patched Boot.img file.
www.droidwin.com
Anyway, yes, use the local upgrade APK, put the downgrade file in the root of storage, run it. Reboot. Factory reset and wipe data to clear out any leftover crap (don't restore a backup - if you want to use Clone Phone you can do that but only restore app APKs and messages). When it reboots it should offer the latest OOS11 OTA first. If not, just download it and place it in the root and use the local upgrade function in the settings menu of the OOS11 system updater.
There is no need re-lock the bootloader and if you do, you risk a brick that has to be recovered with MSM Tool.
Root by following the guide I linked. I just went through this yesterday after flashing COS broke mobile data. I have Magisk 24.3 working with denylist, Widevine L1, and SafetyNet passes so I have Google Pay.

EtherealRemnant said:
I am running COS C.62 on my OP9 with root and having no issues. Did you make sure to do all the things in this guide?
Root OnePlus ColorOS 12 OxygenOS Android 12 via Magisk
In this tutorial, we will show you detailed steps to root your OnePlus device running ColorOS 12 Android 12 via Magisk Patched Boot.img file.
www.droidwin.com
Anyway, yes, use the local upgrade APK, put the downgrade file in the root of storage, run it. Reboot. Factory reset and wipe data to clear out any leftover crap (don't restore a backup - if you want to use Clone Phone you can do that but only restore app APKs and messages). When it reboots it should offer the latest OOS11 OTA first. If not, just download it and place it in the root and use the local upgrade function in the settings menu of the OOS11 system updater.
There is no need re-lock the bootloader and if you do, you risk a brick that has to be recovered with MSM Tool.
Root by following the guide I linked. I just went through this yesterday after flashing COS broke mobile data. I have Magisk 24.3 working with denylist, Widevine L1, and SafetyNet passes so I have Google Pay.
Click to expand...
Click to collapse
Thank you, ill give it a try.
First i used the payload.bin method and it was crashing, then i reflashed the latest OTA using the local update tool and used the magisk slot b method. still crashing.
It might have less to do with the root and more with me using root to disable certain apps (youtube, chrome, OP community, google news/podcast/tv) i dont want them on my phone but they might be too tightly integrated. If its still crashing on android 11 ill re-enable them and see if that helps.

aaronbaird1 said:
Thank you, ill give it a try.
First i used the payload.bin method and it was crashing, then i reflashed the latest OTA using the local update tool and used the magisk slot b method. still crashing.
It might have less to do with the root and more with me using root to disable certain apps (youtube, chrome, OP community, google news/podcast/tv) i dont want them on my phone but they might be too tightly integrated. If its still crashing on android 11 ill re-enable them and see if that helps.
Click to expand...
Click to collapse
Okay you're on OOS, not COS. COS doesn't have Google apps by default (but has plenty more bloatware, I just don't use it).
It's certainly possible that disabling Google apps is your problem. If you don't want Google apps, you're better off with a custom ROM that doesn't have them. CalyxOS has a beta for OnePlus 9 and it's totally de-Googled. There's also Lineage.

EtherealRemnant said:
Okay you're on OOS, not COS. COS doesn't have Google apps by default (but has plenty more bloatware, I just don't use it).
It's certainly possible that disabling Google apps is your problem. If you don't want Google apps, you're better off with a custom ROM that doesn't have them. CalyxOS has a beta for OnePlus 9 and it's totally de-Googled. There's also Lineage.
Click to expand...
Click to collapse
ahhhh. i didnt realize there was a difference. I thought OP was just calling their android 12 build ColorOS.
Either way, for custom roms i would have to go back to 11 to flash TWRP right? or can you flash custom roms using fastboot?

aaronbaird1 said:
ahhhh. i didnt realize there was a difference. I thought OP was just calling their android 12 build ColorOS.
Either way, for custom roms i would have to go back to 11 to flash TWRP right? or can you flash custom roms using fastboot?
Click to expand...
Click to collapse
You would need to back to 11 because OnePlus hasn't released working sources for 12. Just use the downgrade package, factory reset, then upgrade to 11.2.10.10 and you'll be good to go for custom ROMs. TWRP isn't used for flashing them, they all generally post their own recovery. StagOS was the best one I used (plus the dev is really responsive when there are issues) and people seem to really be enjoying Nameless but that came out after I went back to stock so I haven't tried it yet.
Before you mess with custom ROMs, make sure that you download the global MSM Tool and make sure you can connect it. Honestly since you have to go back anyway, might as well download and use the MSM Tool to get the device back to 11 anyway.
GLOBAL OnePlus 9 MSM TOOL UPDATED
Frist off Im not responsible for anything that happens to your phone!!! VERY SIMPLE IF YOU ARE BICKED,BOOTLOOPED OR JUST WANT TO GO BACK TO 100% STOCK THIS WILL WIPE ALL DATA!!! AN RELOCK BOOTLOADER OOS 11.2.4.4.LE25AA MUST HAVE QAULCOMM...
forum.xda-developers.com
Easiest way to get it into EDL is adb reboot edl but if you want to practice the key combination in case you can't get into the OS, I found if you open the MSM, check use lite firehose, and click Start before you connect the phone, it has less connection errors because it's waiting for the phone so as soon as you connect the cable, it pops up.

EtherealRemnant said:
TWRP isn't used for flashing them, they all generally post their own recovery.
Click to expand...
Click to collapse
Really??? you can tell I haven't messed with custom roms in a long time.
Thank you for all the help. I'll try it out.

aaronbaird1 said:
Really??? you can tell I haven't messed with custom roms in a long time.
Thank you for all the help. I'll try it out.
Click to expand...
Click to collapse
Yeah TWRP has issues. I soft bricked last time I tried to do anything with it and had to use MSM Tool to get back to working order.

Question [FIXED] Hard Bricked LE2115

Background:
I unlocked the bootloader and then proceeded to flash the device from 12 to 11 using THIS tutorial. When I got to the first "fastboot reboot fastboot" the phone never rebooted. The screen is all black. I can't get into recovery or back into fastboot using the button method.
I downloaded the MSM Global tool and got all the drivers installed. I was able to start the flashing process but get "Device not match image" early in the process. I have called OnePlus customer service. They didn't ask any questions just told me to send in the phone. I would rather fix this myself if possible. Any insight and or help is much appreciated.

UPDATE: I found this information, and it had me flash the India 9 Pro version. It worked. I have a booting phone and can now work on getting it back to the US version.

I wish people would stop following the guide for fastboot flashing. Just use the MSM while it still recognizes your device because if fastboot flashing fails, you end up having to flash it multiple times as it's not recognizing it as the correct unit anymore with that level of corruption.
To get back to global firmware, flash this in the local upgrade tool.
https://oxygenos.oneplus.net/OnePlus9Oxygen_22.O.11_OTA_0110_all_2107082125_downgrade_059624cc7298428b.zip
It is the global downgrade package. It will wipe your phone and when it comes back, you will be back on global software.
After you flash that, go to OTA upgrade and it will say it's going to download C.48 but it will actually install 11.2.10.10 and then you will have the latest OOS11.
If you download it directly to the phone or copy it over with a PC, the file may disappear. Enable USB debugging and use adb.
adb push nameof.zip /sdcard/

EtherealRemnant said:
I wish people would stop following the guide for fastboot flashing. Just use the MSM while it still recognizes your device because if fastboot flashing fails, you end up having to flash it multiple times as it's not recognizing it as the correct unit anymore with that level of corruption.
To get back to global firmware, flash this in the local upgrade tool.
https://oxygenos.oneplus.net/OnePlus9Oxygen_22.O.11_OTA_0110_all_2107082125_downgrade_059624cc7298428b.zip
It is the global downgrade package. It will wipe your phone and when it comes back, you will be back on global software.
After you flash that, go to OTA upgrade and it will say it's going to download C.48 but it will actually install 11.2.10.10 and then you will have the latest OOS11.
If you download it directly to the phone or copy it over with a PC, the file may disappear. Enable USB debugging and use adb.
adb push nameof.zip /sdcard/
Click to expand...
Click to collapse
Thanks for that! The phone is back to fulling functioning with the proper version of OOS. It has been a long time since I rooted and ROMed. Fastboot used to be a straightforward method of flashing a stock ROM. Doesn't seem like it is anymore.

hillmom said:
Thanks for that! The phone is back to fulling functioning with the proper version of OOS. It has been a long time since I rooted and ROMed. Fastboot used to be a straightforward method of flashing a stock ROM. Doesn't seem like it is anymore.
Click to expand...
Click to collapse
Glad that it worked. Did you have the bootloader locked? I am just trying to confirm I'm not crazy and that I was actually able to use it with a locked bootloader lol.
Yeah fastboot flashing was the gold standard way to avoid a brick back in the days before A/B partitions and Android Verified Boot came along but not so much now. This device in particular seems to be really fussy about fastboot flashing. I never managed to brick my Pixel 3 XL doing it but I have had to MSM multiple times trying to do fastboot commands and custom recoveries to flash custom ROMs on my OP9. I have got the process down tova science at this point lol. I just went back to stock and rooted it and I'm much happier with that than I was with custom ROMs that were plagued with issues.

EtherealRemnant said:
Glad that it worked. Did you have the bootloader locked? I am just trying to confirm I'm not crazy and that I was actually able to use it with a locked bootloader lol.
Yeah fastboot flashing was the gold standard way to avoid a brick back in the days before A/B partitions and Android Verified Boot came along but not so much now. This device in particular seems to be really fussy about fastboot flashing. I never managed to brick my Pixel 3 XL doing it but I have had to MSM multiple times trying to do fastboot commands and custom recoveries to flash custom ROMs on my OP9. I have got the process down tova science at this point lol. I just went back to stock and rooted it and I'm much happier with that than I was with custom ROMs that were plagued with issues.
Click to expand...
Click to collapse
Sorry, I did it with the bootloader unlocked.
I might go back to Stock soon enough. While not as big a pain as Samsung, also not the easiest phone I've played with either.

EtherealRemnant said:
I wish people would stop following the guide for fastboot flashing. Just use the MSM while it still recognizes your device because if fastboot flashing fails, you end up having to flash it multiple times as it's not recognizing it as the correct unit anymore with that level of corruption.
To get back to global firmware, flash this in the local upgrade tool.
https://oxygenos.oneplus.net/OnePlus9Oxygen_22.O.11_OTA_0110_all_2107082125_downgrade_059624cc7298428b.zip
It is the global downgrade package. It will wipe your phone and when it comes back, you will be back on global software.
After you flash that, go to OTA upgrade and it will say it's going to download C.48 but it will actually install 11.2.10.10 and then you will have the latest OOS11.
If you download it directly to the phone or copy it over with a PC, the file may disappear. Enable USB debugging and use adb.
adb push nameof.zip /sdcard/
Click to expand...
Click to collapse
Hii! My phone is LE2115 a12 C60 can i use this file to go back to OSS11? Also do i need to unlock my bootloader or i can use this even with bootloader locked? Last one where can i find "local update tool"? Thanks a lot

eliasdeejay said:
Hii! My phone is LE2115 a12 C60 can i use this file to go back to OSS11? Also do i need to unlock my bootloader or i can use this even with bootloader locked? Last one where can i find "local update tool"? Thanks a lot
Click to expand...
Click to collapse
Yes, you can use this to go back to OOS11. You shouldn't need to unlock the bootloader as this is an officially sanctioned downgrade package.
Since you're on Android 12 you need to install the local upgrade APK:.
https://oxygenos.oneplus.net/OPLocalUpdate_For_Android12.apk
Install that, push the downgrade zip to /sdcard/, open the newly installed system update app, hit the gear, and it should show you the zip file waiting.

EtherealRemnant said:
Yes, you can use this to go back to OOS11. You shouldn't need to unlock the bootloader as this is an officially sanctioned downgrade package.
Since you're on Android 12 you need to install the local upgrade APK:.
https://oxygenos.oneplus.net/OPLocalUpdate_For_Android12.apk
Install that, push the downgrade zip to /sdcard/, open the newly installed system update app, hit the gear, and it should show you the zip file waiting.
Click to expand...
Click to collapse
Hii! by chance do you know where I can download the previous versions of A12 update? specifically C.48. And if i can install it via local upgrade APK. Thanks!

eliasdeejay said:
Hii! by chance do you know where I can download the previous versions of A12 update? specifically C.48. And if i can install it via local upgrade APK. Thanks!
Click to expand...
Click to collapse
https://android.googleapis.com/packages/ota-api/package/1797d47ddef0fca1411fb006b9c7a1a7ba33d818.zip
There is a pinned post with them. This is C.48 for global and yes, you use the local upgrade but since you're on OOS11, you don't use the APK, use the update function in system settings and tap the gear and you'll see it.

Hi i tried to use the updater on android12 and try to downgrade it to .48 but it return error. So i need to downgrade to android 11 first and then update it again to .48?

cruzzmz said:
Hi i tried to use the updater on android12 and try to downgrade it to .48 but it return error. So i need to downgrade to android 11 first and then update it again to .48?
Click to expand...
Click to collapse
Correct. Only the specific downgrade packages can downgrade. It will also wipe the device. There's no way around this. Once you are back on 11, you can do the local upgrade to flash the full C.48 ROM instead of having to do the whole OTA process (normal process is downgrade, OTA to 11.2.10.10 (it will say it's C.48 but have a file size of like 150MB but it's not), OTA to C.48 so you get to skip a step if you just use the full update package).

EtherealRemnant said:
Correct. Only the specific downgrade packages can downgrade. It will also wipe the device. There's no way around this. Once you are back on 11, you can do the local upgrade to flash the full C.48 ROM instead of having to do the whole OTA process (normal process is downgrade, OTA to 11.2.10.10 (it will say it's C.48 but have a file size of like 150MB but it's not), OTA to C.48 so you get to skip a step if you just use the full update package).
Click to expand...
Click to collapse
Hii is 11.2.10.10 a lot better than 11.2.8.8? Sorry for a lot of questions im new to OnePlus

EtherealRemnant said:
Correct. Only the specific downgrade packages can downgrade. It will also wipe the device. There's no way around this. Once you are back on 11, you can do the local upgrade to flash the full C.48 ROM instead of having to do the whole OTA process (normal process is downgrade, OTA to 11.2.10.10 (it will say it's C.48 but have a file size of like 150MB but it's not), OTA to C.48 so you get to skip a step if you just use the full update package).
Click to expand...
Click to collapse
Ok if i understand correctly, i just use the updater to flash the android 11 zip file that you provided and it will do a full wipe and will restore to android 11. Then i just use the updater again to flasj it to .48
am i correct?

eliasdeejay said:
Hii is 11.2.10.10 a lot better than 11.2.8.8? Sorry for a lot of questions im new to OnePlus
Click to expand...
Click to collapse
I don't know because I didn't get my phone until February so I went right to 11.2.10.10. It is important to update though because it gets you a working OS on both slots instead of just one.
cruzzmz said:
Ok if i understand correctly, i just use the updater to flash the android 11 zip file that you provided and it will do a full wipe and will restore to android 11. Then i just use the updater again to flasj it to .48
am i correct?
Click to expand...
Click to collapse
Yes, if you want to go back to 12.

EtherealRemnant said:
Yes, if you want to go back to 12.
Click to expand...
Click to collapse
yes i want to go to 12 but not the crappy .60

cruzzmz said:
yes i want to go to 12 but not the crappy .60
Click to expand...
Click to collapse
Lol yeah. I'm not too happy with C.60 either. I really don't want to wipe my device and lose my Signal chats again.

EtherealRemnant said:
Lol yeah. I'm not too happy with C.60 either. I really don't want to wipe my device and lose my Signal chats again.
Click to expand...
Click to collapse
my sentiment exactly dunno how OP fk up with the model and the update
so i dont need MSM Tool to downgrade??

cruzzmz said:
my sentiment exactly dunno how OP fk up with the model and the update
so i dont need MSM Tool to downgrade??
Click to expand...
Click to collapse
I don't know what you aren't understanding but I'm tired of repeating myself. Read what I wrote and it answers your question.

EtherealRemnant said:
I don't know what you aren't understanding but I'm tired of repeating myself. Read what I wrote and it answers your question.
Click to expand...
Click to collapse
Ok done it ... on OOS11 now .... no need to unlock bootloader can just flash the file directly.
Will try OOS11 for a while and see if it is worth updating to OOS12

Question How to convert a oneplus 9 tmobile oos12 to pixel experiencie or another rom

Hi everyone! I have a question! Does anyone know how to install a custom rom on the oneplus 9 t mobile with OOS 12? Do I have to downgrade or can I install a rom that has android 12 by default?
My version its LE2117_11_C.19

You should firstly update to the latest OOS12 update TMo gives us. After that unlock bootloader (as per the guide here on the fourms) via unlock code method (you will have to wait for TMo to send that your way as it's device specific) and then follow the instructions from the rom provider.
I'm running StagOS on my TMo OnePlus 9 without issues since their last release, before that ran Lineage, Jaguar, Nameless. As long as you are updated to latest OOS and with an unlocked bootloader, you can flash any rom on here provided you follow their instructions. If you brick your phone you can use the modified MSM tool I posted on one of my threads to un-brick and bring back to life your phone (keep a backup of your data though)

RandomLatinDude said:
You should firstly update to the latest OOS12 update TMo gives us. After that unlock bootloader (as per the guide here on the fourms) via unlock code method (you will have to wait for TMo to send that your way as it's device specific) and then follow the instructions from the rom provider.
I'm running StagOS on my TMo OnePlus 9 without issues since their last release, before that ran Lineage, Jaguar, Nameless. As long as you are updated to latest OOS and with an unlocked bootloader, you can flash any rom on here provided you follow their instructions. If you brick your phone you can use the modified MSM tool I posted on one of my threads to un-brick and bring back to life your phone (keep a backup of your data though)
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so can i follow any tutorial to install any rom if i have unlocked bootloader next to sim? since I tried once to change to global and it worked, I put a module and my cell phone and the phone bricked, with the MSM Tool I was able to recover the OOS t mobile version, but I thought I had to downgrades OOS 11 to install any rom and I never did anything again because of fear for the brick
sorry for my bad English

Yasser.d said:
so can i follow any tutorial to install any rom if i have unlocked bootloader next to sim? since I tried once to change to global and it worked, I put a module and my cell phone and the phone bricked, with the MSM Tool I was able to recover the OOS t mobile version, but I thought I had to downgrades OOS 11 to install any rom and I never did anything again because of fear for the brick
sorry for my bad English
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Yes, that's it. Basically have your phone updated to the latest OxygenOS TMobile can give you,; Have your phone SIM Unlocked AND Bootloader Unlocked and then follow all the steps the Developers of the ROM you choose give for the installation.
If any rom specifically asks for OxygenOS 11, then the same steps are applied except instead of latest OS versión, the one the Dev asks for

Then I will start the installation of some rom that I like on top of the latest update of tmobile OOS 12, do you recommend any specific one that is pixel experience or similar performance?

RandomLatinDude said:
Yes, that's it. Basically have your phone updated to the latest OxygenOS TMobile can give you,; Have your phone SIM Unlocked AND Bootloader Unlocked and then follow all the steps the Developers of the ROM you choose give for the installation.
If any rom specifically asks for OxygenOS 11, then the same steps are applied except instead of latest OS versión, the one the Dev asks for
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For example, when I go to the official lineageOS 19.1 page, it says that the compatible devices are all except mine LE2117, do I continue to install anyway?