[HELp] Rollback from 12.5.x official CN ROM to 12.0.x official CN ROM

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phibersg

Member
Mar 16, 2016
31
7
Can anyone point me to a guide to do a rollback from 12.5.1 CN ROM to any 12.0.x official CN ROM?
The upgrade to Android 11 was a bad mistake, a lot of things are broken and my notifications (Whatsapp, etc) are no longer working properly.

Is there anti-rollback protection in 12.5.1?
 

phibersg

Member
Mar 16, 2016
31
7
I figured out it's as simple as request Bootloader unlock, then using miflash fastboot to flash the official 12.0.15 fastboot rom with the clean all and lock option?

That's all right? nothing special?
 
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phibersg

Member
Mar 16, 2016
31
7
Hi Phibersg, where do I find official rom? - ok found!
However what about ARB Anti rollback

Thanks

I just checked there is no ARB for mi 10 ultra on the 12.0.15..
on my mi 10 ultra:

C:\adb>fastboot getvar anti
anti: 1
finished. total time: 0.009s

anti = 1

which is the same as the number is anti_version.txt in
cas_images_V12.0.15.0.QJJCNXM_20201209.0000.00_10.0_cn\images
 
I just checked there is no ARB for mi 10 ultra on the 12.0.15..
on my mi 10 ultra:

C:\adb>fastboot getvar anti
anti: 1
finished. total time: 0.009s

anti = 1

which is the same as the number is anti_version.txt in
cas_images_V12.0.15.0.QJJCNXM_20201209.0000.00_10.0_cn\images
I am in the same situation and tried rolling back before getting unlocked (still 5 days to go!) however my big issue is to get GAPPS working - contact syncing and WhatsApp changing from phone numbers to contact names at random. Error was AntiRoll Back Error
 

phibersg

Member
Mar 16, 2016
31
7
I am in the same situation and tried rolling back before getting unlocked (still 5 days to go!) however my big issue is to get GAPPS working - contact syncing and WhatsApp changing from phone numbers to contact names at random. Error was AntiRoll Back Error
How are you getting anti rollback error when you are still locked and not able to flash?

For the contacts to numbers issue, just set permission for whatsapp to access Contacts to ALWAYS, don't use Allow only when using app.
that will fix the issue.
 
How are you getting anti rollback error when you are still locked and not able to flash?

For the contacts to numbers issue, just set permission for whatsapp to access Contacts to ALWAYS, don't use Allow only when using app.
that will fix the issue.
I used the Xaiomi MiFlash which works only on Xaiomi ROM So since not changing the boot record I thought it should be ok! I tried to flash back to this ROM cas_images_V12.0.15.0.QJJCNXM_20201209.0000.00_10.0_cn_77d730d8ca.tgz from XaiomiROM.Com. A Flashrom I understand is like an OTA upgrade - but error!
 

phibersg

Member
Mar 16, 2016
31
7
I used the Xaiomi MiFlash which works only on Xaiomi ROM So since not changing the boot record I thought it should be ok! I tried to flash back to this ROM cas_images_V12.0.15.0.QJJCNXM_20201209.0000.00_10.0_cn_77d730d8ca.tgz from XaiomiROM.Com. A Flashrom I understand is like an OTA upgrade - but error!
try again when your bootloader is unlocked! Use the full recovery rom instead of the OTA flashrom.

Ya.. cas_images_V12.0.15.0.QJJCNXM_20201209.0000.00_10.0_cn_77d730d8ca.tgz should be the fastboot rom to use.
 
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phibersg

Member
Mar 16, 2016
31
7
Managed to rollback to 12.0.15 using miflash last night when my BL got unlocked. just by flashing the 12.0.15 fastboot rom over the 12.5.1 rom in the mi 10 ultra.

nothing extra or special was needed..

i did get a error flashing sparsecrclist.txt error, so i just commented out that line in the BAT and it worked.. LOL

One time affair.. all good now!

i am never touching the 12.5 firmware ever again!
 
Last edited:

vtec303

Senior Member
Managed to rollback to 12.0.15 using miflash last night when my BL got unlocked. just by flashing the 12.0.15 fastboot rom over the 12.5.1 rom in the mi 10 ultra.

nothing extra or special was needed..

i did get a error flashing sparsecrclist.txt error, so i just commented out that line in the BAT and it worked.. LOL

One time affair.. all good now!

i am never touching the 12.5 firmware ever again!
If you were bootloader unlocked with twrp installed I'm sure it was possible flashing the 12.0 on 12.5 and than format data (which requires typing "yes") and all would have been good, but that's just my thought based on my android experience and knowledge, cheers
 

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  • 1
    I figured out it's as simple as request Bootloader unlock, then using miflash fastboot to flash the official 12.0.15 fastboot rom with the clean all and lock option?

    That's all right? nothing special?
    1
    I used the Xaiomi MiFlash which works only on Xaiomi ROM So since not changing the boot record I thought it should be ok! I tried to flash back to this ROM cas_images_V12.0.15.0.QJJCNXM_20201209.0000.00_10.0_cn_77d730d8ca.tgz from XaiomiROM.Com. A Flashrom I understand is like an OTA upgrade - but error!
    try again when your bootloader is unlocked! Use the full recovery rom instead of the OTA flashrom.

    Ya.. cas_images_V12.0.15.0.QJJCNXM_20201209.0000.00_10.0_cn_77d730d8ca.tgz should be the fastboot rom to use.
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