FP not working on custom roms - Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe

I have been trying to get a custom rom on my Raphaelin as a daily driver but somehow whichever i try couldn't use the FP, i could register one easily but couldn't use it to unlock the device. Everytime it says the sensor light be dirty or something if the sort.

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Redmi 2(8gb Indian version) VoLTE Support needed

Hello, I posted a previous thread saying theres no volte for redmi2.
The thing is i've tried almost every solution thats out there for enabling VoLTE. But still none of them works.
I've tried flashing Redmi2 Prime ROM(doesnt work) and even flashing other custom roms over it(still doesnt work).
I've tried flashing Volte Patches, Xiaomi Volte modems etc.
Ive tried installing Lineage OS firmware....and the ROM(ofcourse) yet to no avail
I got a suggestion to manually wipe all partitions...but i researched a bit and got to know it hardbricks your device(so thats gotta wait for a while)
So is my Phone a special snowflake among other Redmi2 or is it a problem in my SIM card? If so how do i know which one is at fault?
I know this post might not belong here...but i need a discussion on this one..because there might be other Redmi2 users out there facing the same problem....So if anyone has the same problem do say so in the replies...and we'll see together, which of the solution works by testing them
1)download Mi flash tool
http://en.miui.com/forum.php?mod=att...E5MTF8MzM2MTg0
2)
download fastboot rom redmi 2 prime global stable or china
http://bigota.d.miui.com/V8.1.3.0.LH...23ac47dab8.tgz
above is global stable link.
3) put your phone in fastboot mode, unzip the downloaded rom. (avoid spaces in between folder path/name eg "C:\New Folder\Extracted rom\...." is not allowed instead it should be like C:\New_Folder\Extracted_rom\.......)
4) open mi flashing tool see if your device is listed. refresh to see. select clean all (flash_all.bat) option from bottom of mi flashing tool.
5) click on flash, and let it boot.
you would be able to use VoLTE now in miui rom. if you want to change to any N based roms just flash twrp and clean install any rom.
I don't have any problems with redmi 2 prime rom. VoLte working flawlessly.

fingerprint not working

I flashed arrow os latest 7-10-18 build ,
After boot figerprint isnt working ,option available bit when i touch finger nothing happens ,
Then i flashed msm extended , same happened,
Then i tried havoc 2.0 ,
Same happened,
Before flashing arrow os in msm extended fp works fine but dont know
What happens after flashing arrow os ,
Any fix ?
Hello, i have the same problem redmi 4x 2/16, figerprint isnt working, option available but when i touch finger nothing happens, i've tride to solve this problem the way you adviced on web, but there are no these files to delet on my phone. May be any fix?
Follow this thread:
https://forum.xda-developers.com/xiaomi-redmi-4x/how-to/fixes-redmi-4x-t3858845?nocache=1

How to return to stock?

Hello guys! After experiencing all custom ROMS including Xiaomi.EU, figured out that every single one has some small inconvenience for me and planning to return to stock, eventually using only Magisk and potentially a custom Kernel.
Managed to install every single version of Global Developer ROM, everything works well except the FaceUnlock that was gone, (the phone remained stucked in China region) and I am not able to access the fingerprint section, after few tries it brings me an error message.
Tried also using MIFlash , but the Fastboot ROM writting took 3 sec to write and stopped as successfully, then nothing but bootlooping.
Currently is the phone is functional, but as mentioned before not able to setup new fingerprints (using cache and data from old recovery and those work) neither Face Unlock.
Tried to Google any kind of solution, but unfortunately nothing worked.
Any suggestion is appreciated.
I see that nobody is interested to support, so I continuously researched and figured out that doing a full wipe and following these steps from this post will solve my problem:
https://forum.xda-developers.com/mi-8/help/chinese-mi8-to-global-instructions-t3839665
From I don't know which reason I was blocked on China region without the possibility to changing it.

Unable to register fingerprint on any custom rom

I am new on K20 pro custom rom, I have tried clean flashing evolution x and resurrection remix[official] and whenever I try to open security settings to register a fingerprint the settings starts to lag and the fingerprint only recognises 2-3 taps and in this way it takes about 2 minutes to register a fingerprint and after successfully registering it the device takes about 6-7 seconds even if i tyr to unlock it with pattern please help me :crying: my device is raphaelin

Rom as daily driver (havoc or new lineage?)

hello, i finally got havoc (android 11) working on my razer phone 2 (after a year o passing through because never resolve the fastboot driver issue, in short, in win7 works fine, and finally put all stuf, room, kernel, fix camera, fix bluetooth, etc)
so in my little experience with roms of this mobile, i use as daily driver, no problem at all, but when i flash is a little message about an error, no matter that, is work just fine. but i dont have fingerprint working... even dont show in security options.. simplely dont appear.
is true about security issue (safety net )(maybe i have to say that at firts dont have gapps, but mannage to work ggaps only flashing it as external package... but nothing to worry
my question is, to all people that use this rom, dont work fingerprint, or just me?
and the another one, is lineage 18.1 better than this one? is worth the change for daily use?
thanks, and sorry english is not my firs language XD

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