please help sgh-i747 baseband unknow. modem unknow. null imei how to fix this. thanks

Platform: Samsung Android
Selected port: COM9
Selected model: SGH-I747
Mode: Normal
Phone model: SGH-I747
Firmware compiled date:
Firmware compiled time:
Firmware released date: -รน~
Firmware released time:
SW version:
Old IMEI: Unknown
New IMEI: 353xxxxxxxxxxxxxx
Creating NVM backup
Reading NVM done!
Please, press "OK" button on the phone to allow USB debugging..
Proper android device not found. Make shure that "USB debug" option on the device is turned on.
Write IMEI failed
Performed by 2.3.6 software version