yashsingh1/xdaforums huggingface dataset:
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] meezy5:
very nice, i would like to know which stuff they usef to calubrate xiaomi screens, its gonna be a thing now i think. U can try multitouch test again, i believe that even not oem screen can be calibrated same goes on iphones which i do on daily basis.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] :
There's some calibration utilities in the CIT MENU in setting, touching 5 times on kernel version
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Aevum:
the weird bit is that before going back to the service center, miui 11 the finger print reader was failing 60-70% of the time, Miui 12 constant reboots with the fingerprint reader, when not using it, multitouch was reduced to 5 points

took it back, complained, he claimed he needed to copy the firmware code from the old screen to the new one. but now, FP reader works 100% in miui 12, multitouch detects 10 points.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Cowboy_Henk:
Is it the same as flashing the vendor files from miui 11 on miui 12?

And on stock miui 12.02 qfeuxm (just made the update from 12.01 to 12.02) the fingerprint sensor doesn't work

EDIT: I tried it. I wiped vendor 12.02 and flashed vendor from 11.06. DOESNT WORK!!! MIU LOGO BOOTLOOP.

SO DON'T FLASH OLDER FIRMWARE/VENDOR OVER NEWER ROM!!
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] sorinblu:
Hi, I have the same problem.

I have MIUI 12 and the sensor worked fine.

Sunday the screen broke and today I changed it and it no longer works for me.

Was any solution found to this?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Luigi Pendragon:
Hello,

Same problem here, i had my screen replaced at a small phone repair shop across the street and the fingerprint would cause the phone to reboot on MIUI 12 and Evolv X (5 august 2020 version).

I rolled back to MIUI 11 for the moment. Hoping for a solution or a compatible ROM !
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] sacha2506:
Hello , did you try the samsung versions? they are more expensive and surely of better qualities. In any case it is impossible to find an original screen visibly ...
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] meezy5:
i doubt they will fix it in miui 12 as i see this as an hidden step to stop unauthorized repair services to replace screens, same as apple did on iphones 11. However, on iphone there are 2 manufacturers of displays as far as i know and each one works on their respective motherboards, so if u use correct screen version the message disapperars as well from.settings (already tried) so maybe this goes same with samsumg replacement screen for xiaomi
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] sacha2506:
I also hope but we have no source to buy the correct screens suddenly? For Samsung screens this remains an assumption ... I wrote to several vendors while awaiting a positive response.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] sacha2506:
hello here is the feedback that I had for the different sellers obviously no screen works (fingerprint reader) correctly after the miui 12 update. So I wrote directly to Xiaomi who answered me neither more nor less that for the moment they have no answer without even knowing if a next update will be made from them. here is if any of you have a better software solution i think it would be good to share it.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] igga8003:
12.0.2 and issue is not fixed :( f***ing xiaomi.

p.s. what is the easiest way to roll back to 11 for noob?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] RasKev:
I have the same problem .. I need help please !

I have the same problem
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Cowboy_Henk:
Use mi flash software.

Download fastboot rom from miui 11 for your device here. https://xiaomifirmwareupdater.com/

Make sure to enable clean flash in Mi Flash, not Flash and lock

This will erase everything so make a backup of your data
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Lukeass:
Hello guys im here bcs today is really sad day.

Today after an update on pixel experience rom and update a vendor my finger print scanner stop working.

Tried to reset a date of fingerprint

I tried to change version

Tried to change vendor

Tried to back to original soft ( but on miui when I want to set a fingerprint system just restarting)

I have no clue what to do rn. I think I tried everything and nothing is working. Enyone help?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Langlee:
Hi, i have same issue, but even after rollback for MIUI 11 my new screen don't work well while using Fingerprint scanner. It can unlock your phone and I can use fingerprint scanner - but every time i use it - screen brightness go mad, at the moment of scan it goes too high, after the scan - it became lowered too much. Seems like my display is not compatible with 9t pro drivers, and system can't use it properly foir fingerprint operations, not sure if anybody have issues like that on MIUI 11 with replaced screen...
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Amm2020:
Hi, I have the same problem.

I have MIUI 12 and the sensor worked fine.

Sunday the screen broke and today I changed it and it no longer works for me.

Was any solution found to this?

Please ?? help
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] dagda87:
Yes downgrade to miui11
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] renanpanzarini:
Would it be possible to downgrade to miui 11 and install a ROM like Pixel Experiment based on the previous version of the vendor returning the fingerprint sensor to work?

Obs: I don't like miui and I'm using Pixel Experience without a digital reader because of the restriction brought by miui 12
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Accidd:
Same here. Replaced screen with original as it suppose to be (without frame). 10 points multi-touch. Fingerprint worked correctly on MIUI 12.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] sacha2506:
Thanks for your feedback !

do you have a picture of the new screen you have mounted?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Nickmat:
Yeah I same to😢and what have I doing to use back my fingerprint, please help me
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] ht55cd3:
Multiple clean re-install MIUI 12 solve the problem

I replaced my screen twice, 1st time when I was using MIUI 11 and fingerprint was working perfectly. 2nd time I upgraded to MIUI 12 and had this issue. But after 2 clean re-install and some tricks (from this https://xdaforums.com/k20-pro/how-to/fix-fingerprint-unlock-custom-roms-t3955844), my fingerprint is working perfectly again. So you should try to re-install multiple times until it works.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Accidd:
Hi. Ive run another test. I replaced screen to another phone with genuine 100% original Xiaomi service parts which I'm sure is original. MIUI 12 already installed but can't add fingerprint. Nothing happens when trying to scan. Fingerprint calibration ends on performance chart test failed.

It seems that MIUI 12 can't auto calibrate fingerprint scanner after screen replacement and can't manual calibration.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] sacha2506:
It's very complicated to find a solution ... I hope an update can fix the problem. With a reset of the phone it does not work?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] gp.triple:
not a good news, today I sand back mine to the service,I hope they find a solution
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Voyagerscout:
I have this problem too. My Mi 9T Pro has had its screen replaced by a service center, and now after updating to MIUI 12.0.3 (xiaomi.eu rom) it does not work anymore.

It seems quite a lot of people have this problem.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] vgiozo:
I have NOT replaced the screen on my Mi 9T (but considering doing so, due to ghost-touches / failing touch-sensor on the bottom half of the screen, after 1 year of use), my fingerprint sensor WORKS (albeit slow in MIUI 12), I have no bootloop issues, BUT I am still getting this message in that CIT menu test...

Furthermore, when I go into the "CIT > (dot menu) additional tools > 13. fod fingerprint calibration" (which I believe a user suggested doing so to fix the problem)

- I press START and then

- I am asked to "Put the FLESH FLAT then click NEXT"

...what does that mean?

- I click NEXT nevertheless, all tests read "succeed"

- I am asked to "Put the BLACK FLAT then click NEXT"

...again, what?

- I click NEXT

- all tests read "Succeed", except the "PERFORMANCE_CHART Test, which reads "Failed"...

I also get a message in Chinese at the top

...google translate translates it to

"Please wipe the screen and test head and try again or replace the module"

...not sure what that means...

This test/calibration also breaks Auto Brightness and brightness is high, even if this is not reflected in the brightness setting...I have to power off the screen to get it back...
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] ordenalfabetix:
Hi,

FOD calibration is not a simple test. It is a process in which you need to expose the sensor to a totally light and a totally dark surface.

I needed a few attempts to understand how it works, because it's not at all clear ("flesh start", really?).

In the "flesh start" step, you need to firmly cover the sensor with white paper (thick, that does not let light in, I use the first page of a book, covering the entire lower half of the device), and press the button on the top of the screen. Then remove the white paper and, in the second step, it must be a matte black paper, which also does not let light through (then I use the book cover).

Do this and, unless there is a physical problem with the FOD, the sensor will work perfectly after the procedure.

I no longer have my MI 9T PRO to film the procedure, I returned it to technical assistance and asked them to solve the problem (here where I live, this phone costs more than US $ 500 and the screen replacement costs me approximately US $ 220, it is too much money for me to have a defective device). But I fear they will not be able to fix it and will ask if I want the device this way or my money back and the device without a screen.

One thing I decided: no matter how good the cost benefit of the device, this is my third and last Xiaomi.

In the meantime, I'm using an old Asus Zenfone 3 Zoom that I already replaced the screen with for a probably non-original one and ASUS has not stopped it from working with an ugly and unnecessary update.

Good luck to everyone.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Voyagerscout:
Would you happen to know what "firmware code" he copied? I have been searching all over the internet, and you seem to be the only one who has a working solution for MIUI 12. And, unfortunately, I can not find any information on screen firmware codes.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] vgiozo:
Did what you proposed, however the result was the same...all tests succeed EXCEPT the very final "Performance Chart" test...

can you confirm that your device is successfully passing the very last of tests in the calibration?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Voyagerscout:
I have the same problem, it will not pass the "Performance_Chart" test.

However, I have seen posts off people with working fingerprint scanners, who also do not pass the Performance_Chart.

So I am not sure that is the problem.

With the "Activity Launcher" app, you can also find the hidden software to calibrate the FOD with more options. You can even see what the fingerprint reader sees.

That is all working fine, but enrolling fingerprints in Settings crashes MIUI.

Has anyone tried MIUI 12.1 weekly (xiaomi.eu rom)?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Draknodd:
Same problem. Fixed using 11* vendor and flashing the last EvoX (or whatever rom). It’s clearly a vendor problem. Mind that you have to disable the vendor version check in the Updater-script inside the zip of the rom you want to install
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Voyagerscout:
So, in essense, you're saying that flashing vendor img from miui11, and then updating to miui 12 (by deleting the vendor check in the rom), should fix the issue?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Draknodd:
Yes. use the older vendor and flash the latest rom
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] PanchoPantera123:
How i can do that?

I don´t know nothing about that type of things, so, you can explain me?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] JuanCS85:
I have the same issue, the original display and fingerprint was working on MiUI12. I broke the screen and just replaced it, and the phone reboots every time I try to set up a fingerprint...

I spent some time looking at the logs but I didn't find anything meaningful, just reported the issue using the Feedback app.

09-09 19:52:41.473 6847 6847 F DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
09-09 19:52:41.473 6847 6847 F DEBUG : Build fingerprint: 'Xiaomi/raphael/raphael:10/QKQ1.190825.002/V12.0.2.0.QFKMIXM:user/release-keys'
09-09 19:52:41.473 6847 6847 F DEBUG : Revision: '0'
09-09 19:52:41.473 6847 6847 F DEBUG : ABI: 'arm64'
09-09 19:52:41.474 6847 6847 F DEBUG : Timestamp: 2020-09-09 19:52:41+0800
09-09 19:52:41.474 6847 6847 F DEBUG : pid: 5147, tid: 5147, name: displayfeature@ >>> /vendor/bin/hw/vendor.xiaomi.hardware.displayfeature@1.0-service <<<
09-09 19:52:41.474 6847 6847 F DEBUG : uid: 1000
09-09 19:52:41.474 6847 6847 F DEBUG : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0
09-09 19:52:41.474 6847 6847 F DEBUG : Cause: null pointer dereference
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] sorinblu:
+1
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] PanchoPantera123:
Or more easily, i found the lines corresponding, what i have to change?

assert(raphael.verify_trustzone("TZ.XF.5.2.C1-00019") == "1" || abort("ERROR: This package requires firmware from an Android 10 based MIUI build. Please upgrade firmware and retry!"););

assert(getprop("ro.boot.hwc") == "INDIA" && (raphael.verify_vendor("V12.0.2.0.QFKINXM", "1594320440") == "1" || abort("ERROR: This package requires vendor from atleast V12.0.2.0.QFKINXM. Please upgrade firmware and retry!");) || true);

assert(getprop("ro.boot.hwc") == "CN" && (raphael.verify_vendor("V12.0.2.0.QFKCNXM", "1592326431") == "1" || abort("ERROR: This package requires vendor from atleast V12.0.2.0.QFKCNXM. Please upgrade firmware and retry!");) || true);

assert(getprop("ro.boot.hwc") == "GLOBAL" && (raphael.verify_vendor("V12.0.1.0.QFKMIXM", "1591985769") == "1" || abort("ERROR: This package requires vendor from atleast V12.0.1.0.QFKMIXM. Please upgrade firmware and retry!");) || true);
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Draknodd:
Delete all those 4 lines. Flash vendor (or firmware+vendor) 11.0.6.0. Flash the rom with the modified updater script.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Gonmy:
If I am in Miui 12, what I have to do is download 11.0.6.0 vendor from https://xiaomifirmwareupdater.com/archive/vendor/raphael/ . Then, how I disable vendor check in Miui12 image from https://en.miui.com/ ? And my last question, I have to full erase my phone, then flash 11.0.6 vendor and then flash the modified MIUI12?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Draknodd:
Read the previous post. No Need to wipe the phone
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Gonmy:
Thanks for your answer, but where do I find those lines? There a lot of files inside MIUI12 ROM
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Draknodd:
Man, it's not difficult. Unzip, use Windows search in the directory and It will find the file. Don't ask to be spoon-fed
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Gonmy:
Sorry man, I am really noob in terms of flashig, just got here to get my fingerprint back. Anyways, I didn´t know what file to look for, not how. Howerver, I found updater-script file, but the unique lines with something written about vendor are these:

ui_print("Patching vendor image unconditionally...");

block_image_update("/dev/block/bootdevice/by-name/vendor", package_extract_file("vendor.transfer.list"), "vendor.new.dat.br", "vendor.patch.dat") ||

abort("E2001: Failed to update vendor image.");

show_progress(0.100000, 2);

Do I have to delete these lines in the MIUI12 ROM?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Argom97:
I have the same problem that last post , if you can do a further explanation it would be great, cause its the first time that I have to do something like this.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Draknodd:
Tested only on custom rom. Try with a custom
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] tacocorpz:
First of all thanks for sharing this.

For now, I'm on miui12 eu without a fingerprint due to the crash issue.

What are the risks of using a miui11 vendor file and miui 12 rom? I'm thinking of downgrading to miui 11 then trying your fix.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] nieroivan:
Hi.

It'll be great to have a custom rom exactly as Miui 12 but with the fingertip working.... anyway, do you guys know any custom rom that uses the last android version and the fingertip works flawless?

Thanks
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Fissinger:
Work, sort of

I did it and the fingerprint sensor is working but only in full brightness, the system does not raise the brightness when using the fingerprint as it normally happen

Autobrighness working fine , I have tried a lot of preferences with/without adaptative light, no automatic brigthness as well
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] JuanCS85:
I had the same issue and I fixed it by calibrating the fingerprint sensor in the CIT menu: * # * # 6484 # * # *

During the calibration, on the first step you can use a folded white paper sheet. For the second step you need to cover the sensor with something that completelly blocks the any light.

I've got an error on the last step of the calibration, "PERFORMANCE_CHART Test Failed", but after a few attempts in different light environments, it finally passed all the tests.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Fissinger:
The problem is I'm using Evo x ROM, Is it any way to calibrate it on custom rom? May be Evo x or pixel experience rom?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] PanchoPantera123:
What vendor and what miui do you use?

---------- Post added at 08:47 PM ---------- Previous post was at 08:46 PM ----------

What vendor and what miui do you used?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Draknodd:
That's a thing I've noticed now since I don't use screen lock. With stock miui 11 with old vendor the situation is similar but a little better. I still don't think it's *entirely* a screen fault. Because when registering the fingerprint this does not happen... Mmmm
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] JuanCS85:
Just miui 11, not rooted, no custom recovery.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] trannamptv:
Mod edit - translated by https://translate.google.com:

Surely you have replaced the non-genuine screen, and that is the cause of the conflict on Miui 12

***************************************

Chắc chắn rằng bạn đã thay màn hình không chính hãng, và đó là nguyên nhân gây xung đột trên Miui 12

---------- Post added at 08:23 AM ---------- Previous post was at 08:18 AM ----------

you must have replaced a screen not distributed by xiaomi. This is probably the cause of the conflict on the Miui 12, perhaps the poor screen quality
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Draknodd:
Problem seems to be solved with lineage-17.1-20200512-UNOFFICIAL-raphael and vendor 11.0.6.0
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Fissinger:
How smooth does it works? Any problem with the ROM? Which firmware? Is it the same of the vendor?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Draknodd:
It's lineage, so smooth as hell. No problema with the rom. I flashed both firmware and vendor (same version)
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Fissinger:
Did you do any special step?

Can you provide me where did you find that vendor and firmware? I only have firmware v11 and v12 download
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Draknodd:
it's 11. typing error.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] redblack68:
Sorry,

how can i check if my screen is 5 or 10 points ? Thank you
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Draknodd:
Search "Multi Touch Test" on Play Store.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] redblack68:
Thank you. 5 Points :(
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] hamiz34:
I am having the same problem. Fingerprint fails. I put a pattern lock on the device and after the device is turned off and on, it asks for a 4 digit password. 4 opens at input 0 but restarts as soon as they are opened. I applied for bootloader unlock it gave 1440 hours*￼.We will never cross paths with Xiaomi again...
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Draknodd:
Finally Tested my theory about the screen

Bought from Aliexpress a new screen replacement, 10 point multi touch AMOLED from manufacturer Samsung. Everything working perfectly with no problems on latest vendor.

Online you can find the following replacements:

Cheap IPS panel, around 30/40 $ -> NOT WORKING

5 Point touch OLED, around 70$ -> Working only with vendor 11

10 point touch AMOLED Samsung, around 130$ -> Perfectly working
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] LorenzoRamosChaves:
waiting fix update on miui12
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Ramoninacio:
someone found the solution to this problem ?? I'm going through this situation. I changed the global Rom to Rom .eu but the biometrics problem still remains.

---------- Post added at 04:55 AM ---------- Previous post was at 04:45 AM ----------

someone found the solution to this problem ?? I'm going through this situation. I changed the global Rom to Rom .eu but the biometrics problem still remains.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Draknodd:
Is it 5 point touch or 10 point touch ?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] laanrobe:
5 point touch according to data shown with developer option set to 'Show taps' and 'Pointer location'.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Draknodd:
Then it's not the original. The original Is branded Samsung and it's a 10 point touch screen
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] laanrobe:
See attached for what I ordered. It claims to be original OEM, seems I was misled... View attachment 5114373
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Draknodd:
I made the same error don't worry.

This works:

https://it.aliexpress.com/item/4000691686320.html?spm=a2g0s.9042311.0.0.41084c4d4VnhIQ

It's 136USD, not very cheap but at least it's original
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] laanrobe:
Thanks for the advice. However, not worth it for me. I already spend USD150 to get this replacement screen installed. Not going to spend another USD180 for a USD400 phone... I'll save it for an early replacement of this Xiaomi Mi 9T Pro in 2021 and live without fingerprint unlock until then.

Next phone will be one with warranty in the US, no more Xiaomi for me.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] sagor1:
Same problem after changing the lcd now fingerprint is not working & phones get restart.

When i did fingerprint test on CIT menu it's get automatically restart & ask me for 4 digit password which i didn't set,

After press 0000 it's get restart automatically.

Is there anyway to backup data without pass this unlock process?