a520f writing cert fail

after read cert and reset msl with imei gurus for converting dual sim write cert faile
i havent backup of efs now how to restore imei?


Phone Found Wait...
TEST MODE OK..
Model := SM-A520F
VER := A520FXXS4BRA1/A520FOJV4BRA2/A520FXXU4BRAB/A520FXXS4BRA1
Phone IMEI := 000000000000000
Sorry this device only support UART INTERFACE...

!!! FAIL !!!!
Total Time Take...00:00:34
Log Saved

i havent backup of efs now how to restore imei?