Rollback Android 11 -> 10 results in Widevine L3 on Poco F2 Pro

[Dadovvv]

Not in my case. My persistbak seems to hold its original files, while persist clearly was modified.
Can you confirm how your original persist partition (the one you've backed up) looks like?
Here is a screenshot of my persist and persistbak contents.

I know but as I told u persist.img is modified by xiaomi.eu and persistbak is your original. So basically u can use persistbak as persist img
Ok wait. Didn't notice your persistbak picture it really have less file, how about file size is persist and persistbak same?

 

[AlexJi]

I know but as I told u persist.img is modified by xiaomi.eu and persistbak is your original. So basically u can use persistbak as persist img
Ok wait. Didn't notice your persistbak picture it really have less file

That's what confuses me.
Maybe all these other files in persist appeared after I flashed xiaomi.eu and it's safe to flash persist with persistbak.img as those are the only original files?

 

[Dadovvv]

That's what confuses me.
Maybe all these other files in persist appeared after I flashed xiaomi.eu and it's safe to flash persist with persistbak.img as those are the only original files?

Mine original is also different in file amount but exactly the same in file size. Yes u can flash persistbak as persist u have nothing to lose if u don't have your original persist.img ( just create backup of existing "broken"persist now in any case)
Here is mine persist and persistbak see filesize

 

[AlexJi]

Mine original is also different in file amount but exactly the same in file size. Yes u can flash persistbak as persist u have nothing to lose if u don't have your original persist.img ( just create backup of existing "broken"persist now in any case)
Here is mine persist and persistbak see filesize

Yeah, the filesize is the same because both are the images of a partition which size happens to be 64mb.
What bugs me is that somehow I still have Widevine L1 on Android 11. Would be really bad to loose that one as well.

What an unfortunate turn of events. I had my persist backed up as soon as I've got my bootloader unlocked, but I accidentally overwrote that backup with another backup of a corrupted persist today, when I wanted to check out its current state.

 

[Dadovvv]

Yeah, the filesize is the same because both are the images of a partition which size happens to be 64mb.
What bugs me is that somehow I still have Widevine L1 on Android 11. Would be really bad to loose that one as well.

What an unfortunate turn of events. I had my persist backed up as soon as I've got my bootloader unlocked, but I accidentally overwrote that backup with another backup of a corrupted persist today, when I wanted to check out its current state.

u cant lose L1 in android 11 if u now create backup of persist and persistbak. after u backup u can flash persistbak as persist.
Here is example for redmi note 8 fixing persist using persistbak https://en.gizchina.it/2020/07/come-riparare-ripristinare-persist-partition-redmi-note-8/

just checked and original persist have that file amount like yours persistbak, just after flashing persist create more file. thats why u have more file in persist. so dont worry u can safely flash bak as persist.
Also u can use manual method of creating backup and restoring persist in this whay u know what u doing and u cant mess anyting, see my post here for creating and restoring persist https://forum.xda-developers.com/t/will-i-lose-widevine-l1.4072175/

 

[AlexJi]

u cant lose L1 in android 11 if u now create backup of persist and persistbak. after u backup u can flash persistbak as persist.
Here is example for redmi note 8 fixing persist using persistbak https://en.gizchina.it/2020/07/come-riparare-ripristinare-persist-partition-redmi-note-8/

just checked and original persist have that file amount like yours persistbak, just after flashing persist create more file. thats why u have more file in persist. so dont worry u can safely flash bak as persist.
Also u can use manual method of creating backup and restoring persist in this whay u know what u doing and u cant mess anyting, see my post here for creating and restoring persist https://forum.xda-developers.com/t/will-i-lose-widevine-l1.4072175/

So I copied persistbak to persist partition using your instructions except I've copied to sda22, since by-name pointed to that partition in regards to persist.
Camera calibrated successfully, but fingerprint stopped working and Widevine L3 still, so it doesn't work.

Edit:
Something really strange just happened. I've noticed finish setting up your device notification in the settings, which I pressed. This prompted me to redo screen lock password and setup google account which I skipped. Suddenly Widevine L1 now in DRM Info.
Don't know what to say. Fingerprint still doesn't work.

Edit2: I've successfully calibrated FOD using CIT menu's FOD calibration.
Now it seems like I have everything in order. I will continue testing if everything works properly right now.
Would be great if you could suggest what should I check to ensure that I did not break something.
Anyway, thank you! I'll edit my OP to include the summary.

 

[NOSS8]

So I copied persistbak to persist partition using your instructions except I've copied to sda22, since by-name pointed to that partition in regards to persist.
Camera calibrated successfully, but fingerprint stopped working and Widevine L3 still, so it doesn't work.

Edit:
Something really strange just happened. I've noticed finish setting up your device notification in the settings, which I pressed. This prompted me to redo screen lock password and setup google account which I skipped. Suddenly Widevine L1 now in DRM Info.
Don't know what to say. Fingerprint still doesn't work.

And if you try V12.2.4.0.RJKMIXM with miflash?

 

[AlexJi]

And if you try V12.2.4.0.RJKMIXM with miflash?

I am currently doing OTA update to EEA 12.2.4.0.RJKEUXM to check if Widevine L1 is still there and nothing broke. If you have not read my second edit in my previous post, it basically tells that it looks like copying persistbak to persist solved the problem.

 

[NOSS8]

I am currently doing OTA update to EEA 12.2.4.0.RJKEUXM to check if Widevine L1 is still there and nothing broke. If you have not read my second edit in my previous post, it basically tells that it looks like copying persistbak to persist solved the problem.

Good for you.
would appear that the EEA is more difficult than the global one.

 

[Dadovvv]

So I copied persistbak to persist partition using your instructions except I've copied to sda22, since by-name pointed to that partition in regards to persist.
Camera calibrated successfully, but fingerprint stopped working and Widevine L3 still, so it doesn't work.

Edit:
Something really strange just happened. I've noticed finish setting up your device notification in the settings, which I pressed. This prompted me to redo screen lock password and setup google account which I skipped. Suddenly Widevine L1 now in DRM Info.
Don't know what to say. Fingerprint still doesn't work.

Edit2: I've successfully calibrated FOD using CIT menu's FOD calibration.
Now it seems like I have everything in order. I will continue testing if everything works properly right now.
Would be great if you could suggest what should I check to ensure that I did not break something.
Anyway, thank you! I'll edit my OP to include the summary.

-yes sda22 is on poco f2 pro, on mi 9t pro is sda23

-yes that is normal behaviour for FOD after calibration u will be fine. and all others sensors should be fine don't worry. U can do test sensors in CIT menu if u want to make sure everything ok

The steps i was doing is restore over terminal emulator my persist img, after that i flashed same rom over miflash, and as i mentioned before my widewine is back to L1 with working sensors.

 

[AlexJi]

-yes sda22 is on poco f2 pro, on mi 9t pro is sda23

-yes that is normal behaviour for FOD after calibration u will be fine. and all others sensors should be fine don't worry. U can do test sensors in CIT menu if u want to make sure everything ok

The steps i was doing is restore over terminal emulator my persist img, after that i flashed same rom over miflash, and as i mentioned before my widewine is back to L1 with working sensors.

Just updated to EEA 12.2.4.0.RJKEUXM OTA and then fastboot flashed EEA 12.0.3.0.QJKEUXM back.
Everything still works properly along with Widevine L1. I've backed up my persist properly this time.
Seems like some files are still missing in persist even after calibration but from the looks of it nothing's broken cause of that, so I'll live with it.

Next I'll check xiaomi.eu with Android 10 and if it destroys my Widevine certification, I'll just reflash my backup of persist.
Thanks again!

 

[Dadovvv]

Just updated to EEA 12.2.4.0.RJKEUXM OTA and then fastboot flashed EEA 12.0.3.0.QJKEUXM back.
Everything still works properly along with Widevine L1. I've backed up my persist properly this time.
Seems like some files are still missing in persist even after calibration but from the looks of it nothing's broken cause of that, so I'll live with it.

Next I'll check xiaomi.eu with Android 10 and if it destroys my Widevine certification, I'll just reflash my backup of persist.
Thanks again!

xiaomi.eu Android 10 should be fine, the only one problematic is latest xiaomi.eu weekly causing broken L1 on downgrade.
Anyway glad u solved problem

 

[MCJD]

Just updated to EEA 12.2.4.0.RJKEUXM OTA and then fastboot flashed EEA 12.0.3.0.QJKEUXM back.
Everything still works properly along with Widevine L1. I've backed up my persist properly this time.
Seems like some files are still missing in persist even after calibration but from the looks of it nothing's broken cause of that, so I'll live with it.

Next I'll check xiaomi.eu with Android 10 and if it destroys my Widevine certification, I'll just reflash my backup of persist.
Thanks again!

Hi bro, i have the same issue, i lost mi Widevine L1 after a Rollback, i have an answer for you ¿Do you have a previously backup of your persist or you do another process to restore that? I'm very grateful it you can put step by step what are you do to solve that issue.

 

[Dadovvv]

Hi bro, i have the same issue, i lost mi Widevine L1 after a Rollback, i have an answer for you ¿Do you have a previously backup of your persist or you do another process to restore that? I'm very grateful it you can put step by step what are you do to solve that issue.

read all thread and u will find step by step answer

 

[AlexJi]

Hi bro, i have the same issue, i lost mi Widevine L1 after a Rollback, i have an answer for you ¿Do you have a previously backup of your persist or you do another process to restore that? I'm very grateful it you can put step by step what are you do to solve that issue.

Before you delve into flashing partitions like persist, try factory resetting your phone and then go through the initial setup WITHOUT restoring from any kind of online backup be it xiaomi or google. Keep in mind that apart from broken persist, backup recovery from cloud services broke my Widevine L1 AS WELL.

If that doesn't help, then you have to flash persist with your persistbak.
Load up some recovery with adb access like TWRP 3.4.2B by wzsx150 and let's get things rolling:

1. First of all back up your persist and persistbak.
   adb shell dd if=/dev/block/bootdevice/by-name/persist of=/sdcard/persist.img adb pull /sdcard/persist.img persist.img adb shell dd if=/dev/block/bootdevice/by-name/persistbak of=/sdcard/persistbak.img adb pull /sdcard/persistbak.img persistbak.img
2. Then flash persist with persistbak.
   adb shell dd if=/dev/block/bootdevice/by-name/persistbak of=/dev/block/bootdevice/by-name/persist
3. Fastboot flash stock ROM and calibrate all sensors in CIT menu's additional tools.
   ( Settings->About phone->All specs, press Kernel version multiple times, three dots->additional tools)
4. Add fingerprint, update Widevine certificate (Settings->Passwords & security->Fingerprint unlock->Fingerprint payments->Widevine (L1)->Certificate) and check Widevine L1 status returns.
5. Backup new persist from recovery.
   adb shell dd if=/dev/block/bootdevice/by-name/persist of=/sdcard/persist.img adb pull /sdcard/persist.img persistRestored.img
   
   
   Now if you followed my instructions carefully, you can try flashing your old persist and check if Widevine L1 is still there even if you press certificate button to update it. This is the case for me. Currently I have my original persist and Widevine L1 is still there and updates as it should on Android 10.