No SIM and na WIFI after OTA update on a MIUI12

[alividmar]

Hi
Situation is :
After OTA update on MIUI 12 the phone lost wifi and SIM signal.
I factory reset it and manage to flash offical MIUI 12 , but problem is not solved-
Locked bootloader so I'm unable to go to EDL mode to restore MI8xqcn file.
After some reserch I find the basband is missing??
Is there any solution to this problem?
Thank you.