I am looking for an Android program to allow fingerprint unlocking of my Lenovo P2 phone running Android 8.1.

(The built-in support and settings appear not to work in the current mode I am testing where the /data partition is unencrypted; I believe the fingerprint data is stored in an encrypted form elsewhere.)

The app should ideally be lightweight and do just that (unlocking the lockscreen), I am not looking for launcher/app/folder locking.

It would be great if it had the ability to switch quickly to PIN unlocking from the lock screen, but it is not essential.

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