After restarting the phone, the fingerprint reader does not recognize the fingerprint

Good day. After restarting the phone, the fingerprint reader does not recognize the fingerprint. If I don’t restart or turn off the phone, I can unlock it at any time via the fingerprint reader. When I restart the phone, the reader does not recognize the fingerprint and I have to set everything again.
I have a SMARTISAN U3 Pro (NUT PRO 2) 6 / 128GB.
I tried all ROMs from MOKEE …
I beg your advice. Thank you very much.

Try delete /data/system/locksettings.db
and /data/system/users/0/settings_fingerprint.xml

Thanks, how do I do that? I’m not proficient in that … any instructions please? Thank you very much for your answer.