Huawei P 20 lite can no longer call?

Vu
- in P series
1

When I receive a call, I hear my ringtone, but I can't open the call screen and the notification comes and goes directly when I try to call someone, the call screen is not displayed. And my friend has the same model. And that doesn't work either.

Pe

Carry out factory reset.

Back up all data beforehand, make a backup!