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Settings : Security and privacy : Lock and unlock phone 293
3.
Check for app updates.
Open the Play Store app, then touch your profile icon
> Manage apps and device.
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.