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Settings : Security & privacy : Lock and unlock phone
After each troubleshooting step, check to see if your issue is fixed.
1.
Turn your phone off and then on again.
2.
Check if a software update is available
3.
Check for app updates.
Open
the Play Store app, then touch your profile icon
4.
Use safe mode
to see if apps you installed are causing the issue and uninstall as needed.
If the sensor works correctly in safe mode, a 3rd party app is probably causing the issue. These apps can
cause issues: lock screen apps, app locks that use the fingerprint sensor, RAM boosters, and RAM
cleaners.
5.
Reset the phone.
for your phone.
> Manage apps & device.
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