oppo a37f imei repair problum

oppo a37f imei null basebnd unknown pls tell mi how to repair imei..


Port : COM12 : Qualcomm HS-USB Diagnostics 9091 (COM12)
Baud Rate : 921600
Device : Oppo A37f
Operation : Repair IMEI
Opening Port... OK
Reading Information... Failed
Operation Failed.
Elapsed Time: 00:02
[Module Ver. 4.8]
Log Saved to Logs\180530_153758.log