OnePlus 8 Pro Repair IMEI Solution By UMT
1– Applications must be installed on the phone from here

2– Go to the phone and enter the code *#801#
3– Drivers should be fixed as OPPO HS-USB MDM Diagnostics 276F
4– Follow the explanation in the picture
5– Open Ultimate Multi Tool – GSM, go to OnePlus
5– Open Ultimate Multi Tool – GSM, go to OnePlus
Done.