No worries, as long as you have fastboot access, you'll be able to get it working. Let me know how you get on. I think once you get persist.img, take a twrp backup and store it somewhere. I think I will too at the weekend as well.
Hey Mark i am back with some not that good news, because I tried al the methods you point me at, and none of them worked.
Yes i did the dirty flash and installed the Chinese stable version 12.0.15 fastboot rom via MiFlash, went to see if the problem was solved but nothing.
So i decided to install via TWRP the 2 zip files of the links you left and in this case they were not installed.
Tried to install the boot image you gave me and nothing. i tried all these actions during on the stable fastboot rom.
Then decided to flash via TWRP the Chinese stable 12.0.15 zip file. went to check and the problem still there. tried to flash the two zips again and nothing and also the boot img. nothing.
believe me i almost throw the pone to the sea. cause i live in front of the sea.... jajajaja this phone its making me crazy
So i decides again to come back via TWRP the rom eu 21.1.13 everything normal no errors during the installation but at the end no fingerprint function.
One ting to recall is that after the installation of your persist img i went to check the fingerprint for and for 1 or 2 seconds i thought it was going to work, but then the message that "couldn't add the fingerprint, try later"
i did the CIT test for the fingerprint and this is the result:
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