Migration to Android Pie - Fingerprints error

• /e/ version: Pie
• Device model: Fairphone 2
• When it started to occur: the next day after the migration from Nougat
• Reproducible with the last /e/ version: 20190114
• Reproducible with LineageOS: NA

Summary

Migration to Android Pie - Fingerprints error

• The device is unusable
• The bug is the source of a data loss or a big waste of time
• The bug concerns a tierce app
• The bug concerns security
• The bug concerns privacy

The problem

This case can occur after updating to Android Pie.
Every time the protection schema I device is still locked.

Solutions

Workaround If the device is not encrypted, we need to delete this file via TWRP : /data/system/locksettings.db

After booting, the protection schema is disabled. So, the device can work!