Fingerprint unlock Problems - Xiaomi Poco F2 Pro (Redmi K30 Pro) Questions & Ans

Most of the time fingerprint unlock works perfect, but sometimes it wont accept my fingerprint at all. After a while it just works perfectly again. Screen isnt dirty. Anyone Else has this Problem? I Hope its Just a Software Bug...

Register the same finger again as 2nd fingerprint.
Probably it will from then work just fine

I have noticed that fingerprint doesn't work (or have to try many times) in stronger sunlight ...

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Fingerprint sensor calibration problems

When i enter the testing menu on *#0*# and test the fingerprint sensor i get 1 pass and other tests fail. My fingerprint scanner is working fine btw. Can anyone tell me why this is happening and whats their phone's status ? Tia
I have been looking for an explanation as well. I've tested this on my S6, and two S6 Edge straight out the box. They all failed in at least two tests.
As long as the fingerprint sensor is working though, I don't really care.

Fingerprint Sensor Works/Doesn't Work Randomly

Hello, I set up my finger prints and turned on the service but have found that it only works sometimes. When it does works it is extremely fast and useful. It will work anytime I touch it and then a couple minutes later touching the sensor won't do anything for a while. Then it will randomly work again later on. Is anyone else noticing this?
I've been very pleasantly surprised with the fingerprint sensor on my S8+ unit. That was the only thing people complained about before the release of the phone, but mine has been spot on 19/20 times. Maybe add a few more versions of your finger or try from scratch?
Try adding multiple fingerprints on the same finger. I also was surprised how amazing the fingerprint works. Very sensitive and VERY fast. But I added minimum of 3 fingerprints on my right index finger
Sent from my SM-G955U using Tapatalk
Had this happen the other day. Pull-down gesture did not work either. Had to restart the phone. Lots of bugs in this device at launch apparently...
Same thing had happen to me. After a while it just stops working and have to reboot. Anyone know how we can bring this issue to light so it gets fixed? I tried turning off power saving in case the phone was actually killing the system app but it didn't work. Any solutions other than constantly rebooting
I've had similar thing happen today. Most of the time placing the finger on the sensor will unlock it right away. Today, my finger sat there and sat there, no error returned, but no scan either. It was just doing nothing. I tried a few times and it started working again. I'm using the Canadian S8+.
When the fingerprint sensor is apparently stuck, you could check the sensor status in the diagnostics: *#0*#

Fingerprint sensor issue

Anyone else had an issue where fingerprint sensor just stopped working. Can't delete old finger prints, can't set up new ones can't use face unlock either.
KHGerrard said:
Anyone else had an issue where fingerprint sensor just stopped working. Can't delete old finger prints, can't set up new ones can't use face unlock either.
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Yes i had this sometimes cus of the widevine lvl Bug.
Im only want to watch Primevideo, Still loading... Now i locked my Phone, and ich cant unlock them via Fingerprint and No faceid. The only worked fix ist reboot the devices..

OnePlus 8T KB2003 Model - fingerprint issue

Hello,
I have this phone for near 1 year and I always had this problem.
The problem is not happening very often but it happens by time on time.
It was happening more often before, when the phone stays with locked screen for a longer period.
But now it happens whenever it wants and I can't understand what could be the issue.
Maybe some process is failing by my opinion.
So the problem is that sometimes when I put my finger on the fingerprint icon on the screen while the phone is locked, nothing is happening, the fingerprint icon is not active and it doesn't read my finger. So I need to enter my pincode, the fingerprint sensor is just not working at all. When I unlock the phone with pincode and then lock it, the fingerprint is now working, until sometime later.
I'll be very thankful if someone can help me with this.
Thank you!
AndroidIsTheBestt said:
Hello,
I have this phone for near 1 year and I always had this problem.
The problem is not happening very often but it happens by time on time.
It was happening more often before, when the phone stays with locked screen for a longer period.
But now it happens whenever it wants and I can't understand what could be the issue.
Maybe some process is failing by my opinion.
So the problem is that sometimes when I put my finger on the fingerprint icon on the screen while the phone is locked, nothing is happening, the fingerprint icon is not active and it doesn't read my finger. So I need to enter my pincode, the fingerprint sensor is just not working at all. When I unlock the phone with pincode and then lock it, the fingerprint is now working, until sometime later.
I'll be very thankful if someone can help me with this.
Thank you!
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Click to collapse
I believe that's by design. After a certain amount of time you're asked to login using you password. Once you've entered your password the timer gets reset.
I've seen this on other phones and it also happens on both of my 8Ts.
BillGoss said:
I believe that's by design. After a certain amount of time you're asked to login using you password. Once you've entered your password the timer gets reset.
I've seen this on other phones and it also happens on both of my 8Ts.
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Thank you, Bill. This kinda answers my question, too bad there is no security option to define if you want this or no.
On my OP 8T the fingerprint stopped working well after gluing the protective glass. Without the glass it works fine.

General An Interesting Solution To Fingerprint Scanner Not Working in AOD

Hello,
This is my first post probably after 6-7 years.
In my Pixel 7 Pro [which is a little over one month and one week old] I have found the onscreen FP scanner does not always work when the phone is in AOD mode. If I touch the FP scanner nothing happens; it feels as if it is an image LOL.
Searched internet a bit and found this phenomena is a common problem with phones that have onscreen FP scanner [perhaps more specifically with optical scanner? I dunno].
Checked the solutions and none worked until I found out that if my default finger [which happens to be my right thumb] does not activate the FP scanner it has always been my left thumb that works perfectly fine. It is as if the Scanner was waiting for my other finger to press LOL.
Both my thumbs are clean/have same state of cleanliness during operation.
I think this could be helpful to those who probably scratch their head wondering as to why the FP scanner does not work in AOD. If you have more than one finger assigned, just try the other one.
This also raises a question to me [which might be lame], is Google doing it intentionally requiring the other fingerprint sometimes?
Agreed. Fingerprint scanner is unreliable regardless of AOD. Adding multiple fingers can help, but the reader is just wonky (that's a technical term)
It's worthless. Such an aggravation I just use the login code.
Don't know what you people are doing, my fingerprints (both thumbs) work just fine, once in a blue moon it might miss the first time, however I have never had a failed fingerprint unlock from either AOD or lock screen.
I never have issues with my fingerprint scanner on all 4 fingers I added

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