Thank you very much for your suggestion!
And there really is no such method in the framework. In SPB4 and SPB5 there is
I do only flash too (no root, no magisk....)I see only screen with text and fingerprint icon, but fingerprint "is not acitvated" I have GAPPS version. Phone unlock is working only app unlock is not working...
I am using this version (188.8.131.52 Europe):
Use this recovery 11.3