| Error | Cause | Fix | |-------|-------|-----| | No Diag port found | Diag disabled | Use engineer code or flash eng firmware | | Write failed – permission denied | Secure device | Use Brom + auth bypass | | IMEI remains 000000 | NVM corrupted | Flash full factory NVM first | | No network after repair | Baseband damaged | Reflash modem + nvitem | | Dongle not detected | Driver issue | Reinstall UMT + disable antivirus | | Checksum error | Wrong IMEI length | Last digit auto, use 14 digits + X |
Most operations do not require the phone to be rooted. spd imei repair umt tool