Many online tools claim to generate valid IMEIs. Using a non-original IMEI:
Always use the IMEI from your device’s original box or sticker. Mt6771 Imei Repair
If the repair fails or the IMEI returns to "Null" after a reboot: Many online tools claim to generate valid IMEIs
| Error Message | Cause | Fix |
|---------------|-------|-----|
| STATUS_BROM_CMD_SEND_DA_FAIL | Driver mismatch | Reinstall VCOM drivers, try different USB port |
| S_BROM_DOWNLOAD_DA_FAIL (2004) | Preloader conflict | Use SP Flash Tool’s “Download” button, not “Format” |
| IMEI download failed. Logical address mismatch. | Wrong APDB file | Extract APDB_MT6771_S01M1 from firmware’s system/vendor/etc |
| Phone disconnects during Meta Mode | Low battery or bad cable | Charge to 80%, use a short high-quality cable |
| AT+EGMR = error | No root access | Use Magisk to grant root to terminal emulator | Always use the IMEI from your device’s original
IMEI repair on MT6771-based devices is straightforward using MediaTek’s official tools, provided you have the original IMEI numbers and proper drivers. Always prioritize backing up the NVRAM and protect partitions before any flashing. When done correctly, network functionality can be fully restored.
For device-specific instructions (e.g., Ulefone Armor 7, Blackview BV9800), always consult XDA Developers or the manufacturer’s service manual.
This content is for educational and lawful repair purposes only. The author assumes no responsibility for misuse.