If your Xiaomi 14T Pro's fingerprint scanner suddenly stops recognizing you, it can lock you out of your phone and apps. This is a common hiccup, but it's usually something you can fix yourself without too much trouble.
Clean the Screen and Your Finger
This is the most common fix. The under-display optical sensor on your 14T Pro needs a clean surface to see your fingerprint clearly. Wipe the screen over the sensor area with a soft, dry microfiber cloth.
Make sure your finger is clean and dry, too. Moisture, lotion, grease, or even minor cuts can throw off the reading. I'd start with this simple step, as it resolves the issue more often than you'd think.
Restart Your Phone
A quick reboot can clear out temporary software glitches that might be confusing the sensor. Just press and hold the power button, then tap 'Restart'.
If the phone is completely unresponsive, you can force a restart by holding the power button down for about 15 seconds until you feel it vibrate and the Mi logo appears.
Re-register Your Fingerprint
Sometimes the stored data gets corrupted. Head to Settings > Password & security > Fingerprint unlock. Enter your PIN or password, then tap on the fingerprint that's failing.
Select 'Delete' and then set it up again from scratch. When you re-register, press your finger down firmly and roll it slightly to capture the edges, just like the animation shows. This often gives you a better, more reliable scan.
Check for a Software Update
Xiaomi frequently releases HyperOS updates that include bug fixes for hardware like the fingerprint sensor. Go to Settings > About phone > HyperOS version and tap 'Check for updates'.
If an update is available, install it. It's a good idea to plug in your included 120W charger during the update process to prevent any interruptions.
Inspect Your Screen Protector
A thick, low-quality, or poorly aligned screen protector is the enemy of optical fingerprint sensors. If you recently applied a new protector and the scanner stopped working, that's likely the culprit.
Try removing the protector temporarily to see if the scanner starts working again. If it does, look for a screen protector marketed as "fingerprint-friendly" or specifically compatible with under-display sensors.
Try a Different Finger or Position
If one finger isn't working, try unlocking with a different finger you've registered. Also, pay attention to how you place your finger.
Press the center of your fingertip down firmly and hold it for a full second. Don't just tap it. The sensor needs a moment to read the pattern, especially if you're in a very bright or very dark environment.
Clear the System Cache
Corrupted cache files can cause all sorts of weird behavior, including sensor issues. To clear it, turn off your phone completely. Then, press and hold the Power and Volume Up buttons together until the Mi Recovery menu appears.
Use the volume buttons to navigate to 'Wipe data' (don't worry, this menu is poorly named) and press the power button to select. Then, choose 'Wipe cache' and confirm. Finally, select 'Reboot'. This doesn't delete any personal data like photos or messages.
Disable Battery Protection Mode
This is a specific tip for the 14T Pro. While the battery protection feature (which caps charging at 80%) is great for longevity, some users report it can occasionally interfere with system processes.
Go to Settings > Battery and see if 'Battery protection' or 'Charge to 100%' is enabled. Try turning it off temporarily, restart your phone, and test the fingerprint scanner. You can always turn it back on later.
Boot into Safe Mode
This checks if a recently installed third-party app is causing a conflict. Press and hold the power button until the power menu appears, then long-press the 'Power off' icon on your screen until you see a prompt to reboot to Safe Mode.
Tap 'OK'. If the fingerprint scanner works perfectly in Safe Mode, a downloaded app is likely the problem. Start uninstalling your most recent apps one by one to find the offender.
Check for Sensor Damage
The Xiaomi 14T Pro uses Gorilla Glass 5, which is durable but not the absolute toughest. If you see any new cracks, chips, or deep scratches directly over the lower part of the screen where the sensor sits, physical damage could be the issue.
Similarly, if the phone has been exposed to significant moisture or heat from prolonged 120W charging sessions, internal damage is a possibility. If all software fixes fail and you suspect physical damage, you'll need to contact Xiaomi support for a hardware diagnosis.
