yashsingh1/xdaforums huggingface dataset:
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] thiagodark:
well, i'd wish i have readed it before i broke the screen trying to remove it to clean inside.

it's a really fragile piace.

i knew calibrate menu but i was not aware about "blank paper/black paper" procedure... i even tried to reflash fastboot rom, but got know luck at all, that's why i tried to remove the screen.

that's the price for knowledge, i guess.. :-)
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Cowboy_Henk:
So did you install the new amoled 10 point screen from that aliexpress shop? Is everything working now?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] nieroivan:
Yes. I bought it from that guy on AliExpress and it worked like new.

The shipment to Brazil was pretty fast as well (less than 10 days).
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] thiagodark:
until i broke the screen, yes... it was just fine.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] digitom27:
Thanks for the tutorial. I also have a problem after replacing the display. When I follow the instructions I add the fingerprint, but the phone then restarts and after the restart I can not get through the fingerprint. What's with it? I'll factory settings, but it's happening again. How does it work for you? Did I do something wrong? Thank you very much.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] nieroivan:
Hi. Probably your new screen isn't the Super Amoled with 10 points that was recomended here.

I recomend replace it with the one sold by this vendor:

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

I did it and it worked fine. :)
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] vishal1103:
Goto password and security -> fingerprint unlock -> fingerprint recognition method -> touch

Worked for me . Seems like after update settings were changed .
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Cowboy_Henk:
Ok my situation. I have a 9t pro and my screen was broken and got replaced by a shop. Fingerprint reader doesn"t work with miui 12.

The screen is broken again by a fall.

So best replacement screen is from this shop? https://www.aliexpress.com/item/4000691686320.html?spm=a2g0s.9042311.0.0.41084c4d4VnhIQ

Guaranteed that is a good amoled screen with working fingerprint in MIUI 12 and light sensor?

I'm thinking to buy the most expensive one: 10 point amoled with black frame. Is it easy to do yourself?

But this doesn't come with the fingerprint reader so I have to take the one already installed in my phone right now. But fingerprint reader I have now doesn't work with MIUi 12 so how is this new screen going to work? Finger print reader stays the same no?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] nieroivan:
Hi.

The problem isn't on the fingerprint, but in the screen that you bought. So, don't be worried about take the fingerprint out or replace it... The problem usually is just the screen.

And yes, if you buy this 10 points amoled screen, it'll work.

In my case I didn't bought with the frames and it worked fine.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] thiagodark:
I got mine today (second one) and I can confirm that it's good unit. Just like original, I can't even see the difference... Fingerprint works fine on miui 12, really fast, no problem at all...

I recommend pay for a professional to change it or do it with maximum caution possible. The screen is really fragile...

I believe change only screen is easier than change all components inside to the new frame...

I put my three screens side by side for comparation and I noticed that the one which fingerprint unlock does not work looks thicker and fingerprint hole on amoled is clearly more opaque than the original unit and the one that I bought on this aliexpress link.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] rickyy22:
Which Rom? And what Is the vendor region?

Which Rom? I've never seen this before
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Cowboy_Henk:
I also received the screen + frame yesterday from that seller and WOW it's indeed a very good screen! I'm very satisfied

the product and the seller. First the communication with the seller is top notch, he sends pictures and even a video how to test the screen before installing. He even personally tested the screen before sending it to me, it was a personal video because the package label was visible and he wrote personal codes on the screen.

I ordered on 28th of december and I received it on 14th of January so that's fine. The screen (I ordered with frame) is TOP NOTCH!!

It's an amoled 10 point screen and it's even better than what my repair shop used in a previous repair. Now my FINGERPRINT SENSOR IS WORKING AGAIN (bug in MIUI 12 that doesn't accept bad quality screens) It has all the original internals, it has stickers so you can fix the internals securely. Everything works as it should!!

I RECOMMEND THIS SELLER AND HIS PRODUCT

I had some difficulty installing it because I had to move all the internals from the previous frame to the new frame. Five times I had to close and reopen the phone (Luckily I didn't put glue on the back glass - I'm even thinking of not glueing it for a couple of weeks to be sure) because the front camera didn't open - the fingerprint sensor didn't read - the back cameras didn't work - ...

The reason of the problems was dust or condensation. You have to make sure everything is clean and dry. I cleaned the contacts (of cameras, sensors,...) before closing them.

TIP: Use WD40 electrical contact cleaner and compressed air afterwards to dry it quickly.

Ok next problem: I use Xiaomi.eu ROM 21.1.6/7 and fingerprint sensor works but after 5 ticks when registering a fingerprint it closed. After calibrating the sensor in CIT menu (TIP: use thick white page for "flesh flat" and something MATTE BLACK (not shiny!!!!) for the "black flat") - calibrating was succesful - but again registering didn't work.

I then saw there was an update for Xiaomi.EU ( 21.1.13/14 ) and now the fingerprint registering works PERFECTLY!!!

I used this excellent tutorial (in French but filmed in a good way)

I'm so glad, I now have a brand new phone :)

Some pictures:

View attachment 5188485View attachment 5188487View attachment 5188489View attachment 5188491
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] ennho.net:
cry, I have the same problem, also changed the screen. I hope some one find a solution for this.. Now i went back to miui11
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] thiagodark:
There is a solution: buy a good quality screen on aliexpress link
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] katolyimartin:
Hello there. Same Issuse with Mi9T I have Amoled but 5 point multitouch.. No worth for me to buy again new screen, That-s ok, just that fingerprint. I want to use miui 12.5 beta from Xiaomi.eu. do you think editing vendor file will help?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] katolyimartin:
Okay, an update.

For me there was not any restart, i was able to register my finger, but then sensor can't recognize, and calibrate, always failed. Came back to miui 11, same. I removed the display again, and cleaned the inside of the screen and the sensor lens too.

Then I was able to calibrate, and use, updated from updater to miui 12.0.5 and WORKED.

With 5 point multitouch screen. Checked with more programs, for screen writes always super Amoled, or Samung super Amoled. :) Nothing changed in vendor, or anything, just flashed miui 11.0.4 with Miflash, then updated to MIUI 12. Now I will try the xiaomi.eu mdded roms.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] jcagara08:
I am a latest victim of this sudden death of my AMOLED screen however I do admit into dropping the phone couple of times and usually it's flat on its face. Long story short, caved in for an immediate repair, also costs $90 but fingerprint not working. Downloaded a screen test app and it only shows 5 multi touch points.

Anyone can give a link to that 10 multi touch screen from Aliexpress or MIUI 12 really needs to detect an original screen in order for the fingerprint to work properly?

Really hate the slow scrolling experience with this B Grade AMOLED screen at the moment. Lots of mistyped words and whatnot arrggghhhh
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] jcagara08:
How does it work now? Are you experiencing a slower scrolling overall and some phantom touches when using only one finger?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] jcagara08:
So do you have a link to a 10 point multi touch amoled screen? How is your replacement screen performing at this point?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] grandmasterhag:
I had same issue, but i wans't even aware of screen replacement, since i bought this phone used. I was looking for an answer for a long time, found out that on MIUI 11.4 scrolling, typing and even FOD were working without any problem, but lackness of features brought me to the point where i tried out custom roms, so I'm living right now on evolutionx, without my FOD.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Cowboy_Henk:
Read my post https://xdaforums.com/t/miui-12-fingerprint-unlock-defective.4122135/post-84297309
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] thiagodark:
Perfect until now. Just like original...

https://a.aliexpress.com/_mqHopDd
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] katolyimartin:
Hell yeah, I had slower scrolling experience, and phantom touch when I typing any messages. I had light sensor. But 2 days ago broke it, so now I am gonna buy 10 multitouch, just waiting for a good deal, with fast shipping
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] jcagara08:
sorry fellas I abandoned ship and sold my 9T Pro, heading towards Pixel 4A land, ciao!
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] CipherSwami:
My friend I have a hunch, can you confirm it please. Did you actually see them replacing your screen ( I think K20 and K20 Pro use same screen you can manufactures' spec sheet ). Did they clean flashed ROM, if so which version - Raphael, Raphael EEA Global, Raphael Global, Raphaelin Global.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] CipherSwami:
Which firmware did EVOX used that time? i think you flashed it with 11.0.6.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] JonatanCSilva:
EI'm using the miui12 version with an unlocked and digital bootlooder working with the 5-touch screen. unfortunately the only way I found to use miui12 with this screen.

View attachment 5260109
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] LucasPaschoalick:
Hey guys, I just replaced my original screen of my Xiaomi Mi 9T Pro (k20 Pro) with a aliexpress one,

The link I bought is this https://www.aliexpress.com/item/4000077339977.html

The screen has the 10 multi touch, and the vendors says it the super amoled screen, the same as the original one xiaomi uses in their phones.

the screen truly has the 10 multi fingers capability but the fingerprint does not work in the MIUI 12.

The screen it self is great quality, I only notice some little white balance problems, it seens like the colors has a little blueish tone.

Anyone figured out this fingerprint issue yet?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] 7Potters:
I bought an AMOLED screen manufactured by Samsung, complete with frame, supports 10 touch points, with color quality and contrast very similar to the original screen of my Mi 9T. At first it is a good display, the seller has guaranteed that it is of Original / OEM quality. Here is the link to the part I bought: https://www.aliexpress.com/item/4000156095854.html

The only problem is that biometric recognition does not work on MIUI 12! The sensor registers my fingerprint but the phone does not unlock with it. I've tried to downgrade to MIUI 11 and it didn't work either. Any solution?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] LucasPaschoalick:
Exactly like me... I tried both MIUI systems and in neither the fingerprints work, it does register, but don't unlock the phone. For now I'm using the Unlock by face feature.

I contact the Chinese vendor and he said that I have to calibrate the fingerprint sensor, but I didn't had the time to dig into that yet.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] 7Potters:
I already calibrated the sensor but it didn’t solve the problem...
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] LucasPaschoalick:
Did you find a good guide on how to calibrate? I want to give a try sometime.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] polve93:
Hi guys, i faced the same issue with my mi9se which has an onscreen fingerprint like the mi9t pro.

After screen replacement , fingerprint couldn't be detected with miui 12 so i decided to clean flash miui 11 and then upgrade to miui 12 via OTA. Now fingerprint works fine on my non-original aliexpress screen replacement which has 10 point multitouch feature.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Alivevil:
Guys, recently I have replaced the screen of my Redmi k20 Pro, with a good high copy AMOLED screen the result was:

Quality almost as same, only 5 fingers working, the fingerprint was working but not as good as the original one, it had issues in detection and registering even with calibration.

BUT the problem began when I noticed my phone freeze from time to time, gets random reboots, and random continuously touches, at first I thought that the problem is related to my vendor, I was on miui12.5 vendor, changed to miui 12, and still the same, tried Evo, pixel experience, and other rooms still the same.

I returned to the repair center and got New Screen, the result was:

my phone is stuck at boot, and it will not even be loaded, they told me it's because of my firmware, and they have flashed clean and pure Global miui 12 and wiped everything to the original but it did not even boot.

Recently I have asked my friend to look for the best screen in china market closest to original and got New screen and New result was:

Quality Perfect and equal to the original

10 finger works at the same time

No problem in AOD

Fingerprint performance equal to original one without any problem and hesitate.

everything was really good until I have noticed the freeze and reboots again. I was on Miui 12 Global, reflashed with fastboot to China miui 12 still got problems, did not even use AOD and Fingerprint or a password but the problem was still there.

Then I came across this thread and some others on xiaomi.eu community and tried using the latest miui 11.0.8 China, and Bang! freezing, white screening, boot loops, lock screen freeze, everything is gone.

it has been almost a week, just 2 or 3 reboots.

I have come to the conclusion that the problem is 100% related to none original screen compatibility with miui12 vendor.

does anyone have any update regarding this subject?

is there any way to use miui 12 with this almost original screen?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Alivevil:
Did you have any registered fingerprints on 11 before upgrading to 12? my problem is solved using miui11 and I'm considering testing the miui 12 with OTA instead of fastboot clean flash (i had the problem of freezing and random reboot on that way)

I just wonder to do it with or without setting a password and fingerprint.

ALso, can you tell me your phone model is k20 pro or mi9t pro and you used miui global or china?

I'd be thankful if you read my results here:
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] polve93:
No fingerprint registered on miui 11

My phone is mi9se with global miui.

I advice you to flash miui 12 via OTA and test the system. Remember to perform a nandroid backup before.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Alivevil:
I tried ota update with all the apps and set password and fingerprints.

And the result was Good!

Then again, after that i installed miui 12.5 from 12 and again no problem and everything works great
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] rickyy22:
Hi guys I was trying to buy the screen from the seller on AliExpress but It's out of stock. Do you have any other recommended links? I have a 10 multitouch but still FOD not working. Thank you 🤗
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Akash099:
Bro... I need a help about this fingerprint issue after update. I want to buy a 2nd hand phone,which has this problem.

When he try to register a fingerprint, the device will restarts automatically.

So I want to buy this phone. And downgrade to miui 11 via mi flash tool.

If I downgrade to the miui 11,is will the fingerprint issue solve or not??

Please reply someone... Thanks in advance ❤️
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Huaw3iNova3i:
I solved it. Here's my case. (MI 9T PRO FOD failed).

-Received MI9TPRO from customer 2 weeks ago (blank lcd/nodisplay cause by water leak)

Replaced with OLED with biometric support. Bcoz i'm not the owner of coz my fprint failed to unlock. Few days later customer complaint his on-screen FOD not working. (FYI: this my 1st lcdreplacement for on-screen biometric. i just know these FOD issue when customer return-back his phone ask me to fix the fod problem or return back his money.

#Issue: What, Why & How.

FYI: I bought in online [OLED+bio support] The quality is good its OEM.

#CSI

-read about MIUI v11, v12 related issue fod

-i noted the vendor update script/locksettingdb, persist.img..etc from few forum

-the water leak issue also made me think cause the fod failed

-some say fod will only work if lcdscreen support 10finger touch a.k.a original/high price.

#GO DEEP

-current MIUI 12.0.3

-i deleted owner fod and adding my fprint. I successfull scan, read & add+save my fprint. But still it failed to unlock & not recognise my finger.

-i dloaded app & test touch point. Its only support 5 finger touch not 10.

-update to MIUI 12.0.6 - can read & save but still fod failed

#Longstoryshort

-I finally solved the problem. Its software issue. I cannot elaborate details here (limited time) however i will post a.s.a.p. I made short videos & can proove it. Email me or IG: mystremiumz if urgent
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Akash099:
Bro I inbox to your insta now. It's urgent.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] YamazakiRobert:
i have replaced my screen with a screen with 5 points

some times i have a reboot

and i cant boot any custom rom

if i remove the fp i will be able to boot custom roms?

thanks in advance
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Grandmaster_hag:
Can't find you on IG, and I hope to get answer, since that's a huge issue for me. Please give us respond.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] manxour:
Hi Bro

I have not been able to use my fingerprint for more than a year due to this software problem,

please share your solution with us

And I did not find your Instagram ID to send a message

Please
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Huaw3iNova3i:
If u are on MIUI12, Flash fastboot rom MIUI 11.0.4 (clean install). Do FOD CIT. It will work.

Then u can update to MIUI 12 or custom rom

Tq
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Huaw3iNova3i:
Glad to heard your fprint finally worked.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] harism.ikhsan:
Bro, i cant find you on Ig, can you share how to solve this problem?
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Huaw3iNova3i:
Sorry for late reply. I wish i could help. The reason i didnt put n share here because im buzy, im not sure if ny case not suitable all your problems and solution needs and not sure if i can assist you properly coz my poor english.

However i did solved few xda members from India n Iran having the fod problem (via IG). I will share it here as its proven but give me few days to note it down n publish here soon.

You can request dm me at IG. Stremiumz or mystremiumz.

Thank you..
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Marcolo88:
hi, i have a big problem!

I replaced the screen (at payment) from authorized xiaomi assistence but is 2 times that they put me a screen that recognize only 5 points touch (and in the first screen there was a problem of AOD).

Now they will replace the screen for the third time! But i think it will have the same problem :(

They said that Xiaomi Italia send to them the screen ... so it's original!

If the third screen have this issue, is possibile to solve with some script to flash for recognize the 10 points touch?

Thank you!
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Huaw3iNova3i:
I wish i could help. Its not lcd screen problem I solved the FOD problem on 5 touch. Doesnt matter support 5 or 10 finger touch. One of xda member from india and iran.

However, to help u, i need history of your phone before its broken.

U can IG me.. mystremiumz or stremiumz
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Marcolo88:
Thank you, for me FOD works after calibration. my problem was of 5 point finger touch instead of 10. Maybe you know if is possibile to fix (how i wrote, they said is original screen issued from Xiaomi)
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] mateusmira:
I had a similar issue, If it worked before upgrading, probably the lockscreen PIN won't let you add a fingerprint. As I have a custom recovery on my device, and it has a file manager, I went in the Data folder and deleted the PIN file, and it worked.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Huaw3iNova3i:
Use 12.0.6
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] Squicky2:
Hello

I have the same problem: I replaced the oled screen, and now the fingerprint works very (very) poorly; it is not usable :-(

The Mi 9T Pro has MIUI 12.5.1.0 (RFKEUXM) and the fingerprint calibration does not work either.

I never used custom firmware or flash fimware on a smartphone before.

How do I flash fastboot rom MIUI 11.0.4 ?

Do apps, settings or data get lost when flashing?

If data get lost, is there another way?

Thank you.
[Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe] danilofrias:
Hi brothers.

I will place the only method that worked for me with my Mi 9.

The fix is doing a software calibration after install aftermarket unofficial screen.

I had defective fingerprint issue after replace the screen. I was unable to add fingerprint as well.

Maybe you will have to do it many times until you pass all test steps, dont worry. In time you will made it.

Go to config>about phone>all specs

tap several times on kernel version to get into CIT settings

After that go to 3 dots in upper right corner and go to additional tools > FOG fingerprint calibration

In test page click on first start

It will show a message to put the flash flat.

Get a white papper and fold it.

Click in start and quickly put the folded withe paper covering all green button area and hold the paper (without touch any part of screen with your hand, just the paper) untill it asks for black flat without error.

If u got error start the proccess again until reach the black flat step.

When in black flat step, here are the tricks.

Click to start and quickly put your finger in vertical position (must be thumb finger in vertical position only) on green button and hold it placed until you pass performance chart test ...if all success u will see end test message.

Here is the second trick....when u see the end test message.... dont exit, just reboot the phone.

when it restarts go to setting, enable and add fingerprint. Voila!