Gt- s7392l repair imei help

Even after repair IMEI is only called in emergecia some help ? please

Connect to device …
Device Authentication …
Writing IMEI …
Writing IMEI certificate … failed
Connect to device …
Device Authentication …
Writing IMEI …
Writing IMEI certificate … failed
Device Info (UART)
Model: GT-S7392L
SW Version: S7392LUBUAMI1
Unique Number: CN50842C274F3A0
Flash Memory: –
Chipset : true
Key ID : 0726
Time used : 1.2 s