Thanks to both of you, Ian and The Bird 
With OpenStore there should be a function to revert to a previous version in case of a bug. 
C
Best posts made by carl
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RE: Music app update 3.2.1posted in Support
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RE: double tap to wake up deviceposted in Google Pixel 3a/3a XL
hi defghi, i reboot my device very rarely
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RE: Fingerprint unlock issueposted in 20.04 Focal Fossa
Lakotaubp > my device is a google pixel 3a
CiberSheep > I've done it more than two or three times
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RE: Have you tried other alternative OS systems ?posted in Off topic
I find this discussion very very interesting
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RE: Fingerprint unlock issueposted in 20.04 Focal Fossa
I found the solution
In * System Setting/Security & Privacy
1 - Fingerprint ID/Add Fingerprint
After registering a fingerprint
2 - Locking and unlocking
and choose
A fingerprint