Mt6771 Imei Repair ((exclusive)) Jun 2026

| Error | Likely Cause | Solution | |-------|--------------|----------| | S_BROM_CMD_STARTCMD_FAIL | USB driver issue | Reinstall VCOM drivers, disable driver signature | | Meta connection failed | Wrong COM port | Manually select port in Device Manager | | IMEI write OK but still invalid | NVRAM mismatch | Wipe nvdata and nvram from recovery, retry | | Security check failed | DA (Download Agent) mismatch | Use a patched DA file for MT6771 |

The MediaTek MT6771 (also known as the Helio P60) is a powerful octa-core chipset found in popular mid-range smartphones (e.g., Ulefone, Doogee, Blackview, and some Oppo/Vivo models). A common issue technicians face is a corrupted or null IMEI (shown as "Unknown" or "Invalid") after a firmware flash, factory reset, or software glitch. Mt6771 Imei Repair