[GUIDE]Fix PopUp Camera Calibration - Redmi K20 / Xiaomi Mi 9T Guides, News, & Discussio

After flash or format, some times our device has a NASTY bug on the PopUp Camera, where it keep opening and closing forcing the actuator motor and never re calibrate successfully. Making a bunch of error messages on the OS plus a useless front camera as it wont work.
After doing research, i found out that this problem happen if/when the Persist partition get corrupted. In fact, it's not even the motor and PopUp camera that is broken, but the other sensors that the camera depends to work fine (such as proximity sensor, gyroscope, etc) hence, the phone OS think the camera isn't opening.
To fix, all we need to do is flash a new Persist.img on the Persist Partition via TWRP (no wipe or format need).
1 - Download the latest Official FASTBOOT Stable ROM (even if it's pie, it will still work on a Q based ROM, i tested this) at: https://xiaomifirmwareupdater.com/archive/miui/davinci/ (i got the V10.3.15.0.PFJEUXM or V10.3.11.0.PFJMIXM for my device).
2 - Save it in to your Desktop PC
3 - With 7zip installed on Windows, open the ROM file that you download from the inside
4 - Once you find a folder, explore it untill you find a images folder where a file called Persist.img exist
5 - Extract ONLY the Persist.img and transfer it in to your phone Internal Storage
6 - Make a FULL nanodroid backup once you reboot in to TWRP
7 - In TWRP after the backup, choose the Install Button and then Image Install
8 - Pick the Persist.img and choose to install it in to the Persist Partition
9 - Flash and Reboot
10 - Profit.

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Please do note that following this guide will cause the user to permanently lose Widevine L1 in the process.

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The same thing happened to me when I returned from pixel experience to stock but my problem is that the sensors such as the gyroscope work slow for me, in videos and 360 images it looks lagged, only in the rom xiaomi.eu all the sensors work well, I have to flash persist.img in stock?

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Keylaani said:
The same thing happened to me when I returned from pixel experience to stock but my problem is that the sensors such as the gyroscope work slow for me, in videos and 360 images it looks lagged, only in the rom xiaomi.eu all the sensors work well, I have to flash persist.img in stock?
Click to expand...
Click to collapse
Yes, the problem is these sensors, not the camera it self.
As people report, flash this will make you loose the L1 DRM that Netflix uses..
I personally don't care and i rather fix these than have L1
So if you find no fix.. yes you must flash, but try to fix it in different ways.

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wrong
Pupet_Master said:
After flash or format, some times our device has a NASTY bug on the PopUp Camera, where it keep opening and closing forcing the actuator motor and never re calibrate successfully. Making a bunch of error messages on the OS plus a useless front camera as it wont work.
After doing research, i found out that this problem happen if/when the Persist partition get corrupted. In fact, it's not even the motor and PopUp camera that is broken, but the other sensors that the camera depends to work fine (such as proximity sensor, gyroscope, etc) hence, the phone OS think the camera isn't opening.
To fix, all we need to do is flash a new Persist.img on the Persist Partition via TWRP (no wipe or format need).
1 - Download the latest Official FASTBOOT Stable ROM (even if it's pie, it will still work on a Q based ROM, i tested this) at: https://xiaomifirmwareupdater.com/archive/miui/davinci/ (i got the V10.3.15.0.PFJEUXM or V10.3.11.0.PFJMIXM for my device).
2 - Save it in to your Desktop PC
3 - With 7zip installed on Windows, open the ROM file that you download from the inside
4 - Once you find a folder, explore it untill you find a images folder where a file called Persist.img exist
5 - Extract ONLY the Persist.img and transfer it in to your phone Internal Storage
6 - Make a FULL nanodroid backup once you reboot in to TWRP
7 - In TWRP after the backup, choose the Install Button and then Image Install
8 - Pick the Persist.img and choose to install it in to the Persist Partition
9 - Flash and Reboot
10 - Profit.
Click to expand...
Click to collapse
Totaly wrong
After that camera will open and close until you start camera app and recalibrate with ap

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macakfelix said:
Totaly wrong
After that camera will open and close until you start camera app and recalibrate with ap
Click to expand...
Click to collapse
Read again, it WONT re-calibrate as the SENSOR (not camera or motor) wont read that the camera got open.
If for you it WILL re-calibrate then you don't have the persist partition problem.
You think i didn't re open the camera app and tried to calibrate again?

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Pupet_Master said:
Read again, it WONT re-calibrate as the SENSOR (not camera or motor) wont read that the camera got open.
If for you it WILL re-calibrate then you don't have the persist partition problem.
You think i didn't re open the camera app and tried to calibrate again?
Click to expand...
Click to collapse
I have persist problem (you storage is damaged,, no wifi, etc) i fix everything
But after flashing, front camera open and close.
I write my solution

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macakfelix said:
I have persist problem (you storage is damaged,, no wifi, etc) i fix everything
But after flashing, front camera open and close.
I write my solution
Click to expand...
Click to collapse
For me, storage wasn't damaged nor wifi, only gyroscope

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Was your camera not closed at all? It takes open 2 milimeters?

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mufyto said:
Was your camera not closed at all? It takes open 2 milimeters?
Click to expand...
Click to collapse
It open and close, as the sensor didn't "feel" it was open.

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Pupet_Master said:
It open and close, as the sensor didn't "feel" it was open.
Click to expand...
Click to collapse
Ok, different issue than mine, that is not closed by 2 milimeters. I'm going to change the phone.

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hello. do you know something about this . My phone mi9t back camera stopped work . . İ tried 3 diffirent rom problem not fixed. . i format disk with twrp and install new rom still not fixed. thats mean hardware problem ? But sometimes middle camera work another two not work.. maybe cable unplug ?
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---------- Post added at 01:41 AM ---------- Previous post was at 01:07 AM ----------
i fix problem. if anyone have this problem . thats mean persist files broken. they need to restore persist.ext4.win backup with twrp

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hulyahulya said:
hello. do you know something about this . My phone mi9t back camera stopped work . . İ tried 3 diffirent rom problem not fixed. . i format disk with twrp and install new rom still not fixed. thats mean hardware problem ? But sometimes middle camera work another two not work.. maybe cable unplug ?
---------- Post added at 01:41 AM ---------- Previous post was at 01:07 AM ----------
i fix problem. if anyone have this problem . thats mean persist files broken. they need to restore persist.ext4.win backup with twrp
Click to expand...
Click to collapse
This look like a hardware problem, as the issue i had was with it popping up and never reconizing it did

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Pupet_Master said:
This look like a hardware problem, as the issue i had was with it popping up and never reconizing it did
Click to expand...
Click to collapse
maybe is it possible camera unlug inside phone ? there 2 camera on same cable and another camera on another cable . it cant unlug same time. front camera working fine . its difficult understand hardware or software problem

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hulyahulya said:
maybe is it possible camera unlug inside phone ? there 2 camera on same cable and another camera on another cable . it cant unlug same time. front camera working fine . its difficult understand hardware or software problem
Click to expand...
Click to collapse
It is possible it's just a driver issue, that the camera unplug it self (but very unlikely). I would bet on the actuator motor being dead

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mi 9t pop up camera problem, Rollback from MIUI 11 to MIUI 10
Hello to all.
I have a mi 9t and the pop up camera doesn't work. When I am using the app and trying to take a selfie it gives me an error camera can't open and after many tries it give an error ''couldn't calibrate''. The problem started after update the phone to miui 11 (android 10). Before the update when on the phone was the miui 10 (android 9) the pop up camera was working without problems. Also have other problems when the phone updated to miui 11 such as heating... May I rollback the phone from miui 11 to miui 10 using MI Flash under locked bootloader .. My phone has ARB=1 and the version of miui 10 has ARB=0.
My phone has a version MIUI 11.0.4.0 (QFJEUXM) and I want to flash of MIUI 10.3.10.0 (PFJEUXM)
Is it possible to roolback from MIUI 11 to MIUI 10 under locked bootloader?
Please I am asking your solution. Thanks in advanced

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Hey can anyone help me.
I have same problem but I never flashed any rom, TWRP or rooting on my phone. I replaced my camera module but it didn't solved my problem. Can this solution will help me. Im on MIUI 12 facing this problem from last 4 months.

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Someone pls help!!!
Pupet_Master said:
After flash or format, some times our device has a NASTY bug on the PopUp Camera, where it keep opening and closing forcing the actuator motor and never re calibrate successfully. Making a bunch of error messages on the OS plus a useless front camera as it wont work.
After doing research, i found out that this problem happen if/when the Persist partition get corrupted. In fact, it's not even the motor and PopUp camera that is broken, but the other sensors that the camera depends to work fine (such as proximity sensor, gyroscope, etc) hence, the phone OS think the camera isn't opening.
To fix, all we need to do is flash a new Persist.img on the Persist Partition via TWRP (no wipe or format need).
1 - Download the latest Official FASTBOOT Stable ROM (even if it's pie, it will still work on a Q based ROM, i tested this) at: https://xiaomifirmwareupdater.com/archive/miui/davinci/ (i got the V10.3.15.0.PFJEUXM or V10.3.11.0.PFJMIXM for my device).
2 - Save it in to your Desktop PC
3 - With 7zip installed on Windows, open the ROM file that you download from the inside
4 - Once you find a folder, explore it untill you find a images folder where a file called Persist.img exist
5 - Extract ONLY the Persist.img and transfer it in to your phone Internal Storage
6 - Make a FULL nanodroid backup once you reboot in to TWRP
7 - In TWRP after the backup, choose the Install Button and then Image Install
8 - Pick the Persist.img and choose to install it in to the Persist Partition
9 - Flash and Reboot
10 - Profit.
Click to expand...
Click to collapse
Sir ,. I'm a newbie to this presist issue and all , I did have an old zuk z2 which was pretty straightforward and which was user friendly in flashing . Coming to k20 I still regret flashing roms on this as it turned out to be disaster everything including the anti roll back , this pop bug etc...?
Coming to the topic ?
2 days back I bricked my device really hard as I was not having a computer I manually wrote some scripts randomly and accidently while deleting partitions I deleted persist , then I realised it flashed it via terminal again.
Afterwards I had to force flash firmware as my device ID was all messed up , managed to boot in miui 12.0.3 indian stable version for the first few hours then due to the hype of the situation I flashed PA quartz 4 & i was happy with what I had but then I realised most of my sensors where screwed up except for the fod
Inorder to regain what I lost i extracted persist and flashed it via orange fox then I regained all sensors back but sadly broke my front camera as recaliberation never takes place in reality on pa quartz 4 I don't know the reason for that though.
Now I'm left with two persist backup which I can flash to use whatever I want in need.
SO MY DOUBT
If I do flash the persist.img to persist partition via TWRP when I have pure stock rom installed via fastboot does the front camera calibration work on the same ?? Did it fixed the issue ?? Please confirm ..
Thanks in advance ?
---------- Post added at 09:06 AM ---------- Previous post was at 08:57 AM ----------
Pupet_Master said:
After flash or format, some times our device has a NASTY bug on the PopUp Camera, where it keep opening and closing forcing the actuator motor and never re calibrate successfully. Making a bunch of error messages on the OS plus a useless front camera as it wont work.
After doing research, i found out that this problem happen if/when the Persist partition get corrupted. In fact, it's not even the motor and PopUp camera that is broken, but the other sensors that the camera depends to work fine (such as proximity sensor, gyroscope, etc) hence, the phone OS think the camera isn't opening.
To fix, all we need to do is flash a new Persist.img on the Persist Partition via TWRP (no wipe or format need).
1 - Download the latest Official FASTBOOT Stable ROM (even if it's pie, it will still work on a Q based ROM, i tested this) at: https://xiaomifirmwareupdater.com/archive/miui/davinci/ (i got the V10.3.15.0.PFJEUXM or V10.3.11.0.PFJMIXM for my device).
2 - Save it in to your Desktop PC
3 - With 7zip installed on Windows, open the ROM file that you download from the inside
4 - Once you find a folder, explore it untill you find a images folder where a file called Persist.img exist
5 - Extract ONLY the Persist.img and transfer it in to your phone Internal Storage
6 - Make a FULL nanodroid backup once you reboot in to TWRP
7 - In TWRP after the backup, choose the Install Button and then Image Install
8 - Pick the Persist.img and choose to install it in to the Persist Partition
9 - Flash and Reboot
10 - Profit.
Click to expand...
Click to collapse
akshay07057 said:
Hey can anyone help me.
I have same problem but I never flashed any rom, TWRP or rooting on my phone. I replaced my camera module but it didn't solved my problem. Can this solution will help me. Im on MIUI 12 facing this problem from last 4 months.
Click to expand...
Click to collapse
Brother did try flashing persist via twrp on stock rom if you did it then please tell me I guess if the content stated in thread by the op is true then it should really fix the issue , I'm now left with partially working everything in my phone with 2 persist image files one with cameras working with no sensors another with everything working except for cameras
And by the way it's not an hardware issue it's a software issue so if you didn't flash anything or tamper your phone anyways just replace the device if you are under warranty
---------- Post added at 09:09 AM ---------- Previous post was at 09:06 AM ----------
malok said:
Hello to all.
I have a mi 9t and the pop up camera doesn't work. When I am using the app and trying to take a selfie it gives me an error camera can't open and after many tries it give an error ''couldn't calibrate''. The problem started after update the phone to miui 11 (android 10). Before the update when on the phone was the miui 10 (android 9) the pop up camera was working without problems. Also have other problems when the phone updated to miui 11 such as heating... May I rollback the phone from miui 11 to miui 10 using MI Flash under locked bootloader .. My phone has ARB=1 and the version of miui 10 has ARB=0.
My phone has a version MIUI 11.0.4.0 (QFJEUXM) and I want to flash of MIUI 10.3.10.0 (PFJEUXM)
Is it possible to roolback from MIUI 11 to MIUI 10 under locked bootloader?
Please I am asking your solution. Thanks in advanced
Click to expand...
Click to collapse
It is not really possible to do it via locked bootloader unless you bypass it via edl mode

---

joseph 007 said:
Sir ,. I'm a newbie to this presist issue and all , I did have an old zuk z2 which was pretty straightforward and which was user friendly in flashing . Coming to k20 I still regret flashing roms on this as it turned out to be disaster everything including the anti roll back , this pop bug etc...?
Coming to the topic ?
2 days back I bricked my device really hard as I was not having a computer I manually wrote some scripts randomly and accidently while deleting partitions I deleted persist , then I realised it flashed it via terminal again.
Afterwards I had to force flash firmware as my device ID was all messed up , managed to boot in miui 12.0.3 indian stable version for the first few hours then due to the hype of the situation I flashed PA quartz 4 & i was happy with what I had but then I realised most of my sensors where screwed up except for the fod
Inorder to regain what I lost i extracted persist and flashed it via orange fox then I regained all sensors back but sadly broke my front camera as recaliberation never takes place in reality on pa quartz 4 I don't know the reason for that though.
Now I'm left with two persist backup which I can flash to use whatever I want in need.
SO MY DOUBT
If I do flash the persist.img to persist partition via TWRP when I have pure stock rom installed via fastboot does the front camera calibration work on the same ?? Did it fixed the issue ?? Please confirm ..
Thanks in advance ?
---------- Post added at 09:06 AM ---------- Previous post was at 08:57 AM ----------
Brother did try flashing persist via twrp on stock rom if you did it then please tell me I guess if the content stated in thread by the op is true then it should really fix the issue , I'm now left with partially working everything in my phone with 2 persist image files one with cameras working with no sensors another with everything working except for cameras
And by the way it's not an hardware issue it's a software issue so if you didn't flash anything or tamper your phone anyways just replace the device if you are under warranty
---------- Post added at 09:09 AM ---------- Previous post was at 09:06 AM ----------
It is not really possible to do it via locked bootloader unless you bypass it via edl mode
Click to expand...
Click to collapse
Flash the persist image, for me did indeed fix the issue. How ever if you watch netflix you wont be able to keep doing so as you will lose DRM.
You can do it with what ever ROM you wish to use, Stock, Stock modded, Custom.

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If you want to calibrate, unlock bootloader and install ArrowsOs 11. In settings there is an option at camera named Calibrate Camera. It fixed every problem