Spreadtrum Imei Tool V41 Updated May 2026
Over-the-air updates occasionally corrupt the modem configuration, resulting in "Unknown Baseband."
Before making changes, always create a full NVRAM backup. Here’s how in v41:
This backup preserves your IMEI, Wi-Fi MAC, Bluetooth address, and calibration data. Keep it safe. spreadtrum imei tool v41 updated
Troubleshooting: If you get "Write Failed," try switching to Meta Mode (select "Connect via META" in settings) or use the Backup/Restore method: first backup existing IMEI, modify the backup file, then restore.
| Error Message | Cause | Solution |
|---------------|-------|----------|
| Device not found | Wrong port or driver issue | Reinstall drivers, try a different USB port, reboot PC. |
| Write failed: Permission denied | Write protection enabled | Put phone in META mode (dial *#*#83781#*#* → META → Enable META). |
| Invalid IMEI length | Less than 15 digits | Enter full 15-digit IMEI. The last digit is a checksum. |
| Checksum mismatch | Invalid last digit | Use the tool's calculator auto-fix. |
| Baseband still unknown after success | Corrupted modem firmware | Reflash modem bin via SPD Upgrade Tool, then rewrite IMEI. | This backup preserves your IMEI, Wi-Fi MAC, Bluetooth
Even with the updated version, you might face issues. Here’s how to solve them:
| Error Message | Solution | | :--- | :--- | | "USB Device Not Recognized" | Reinstall SPD USB drivers. Try a different USB port (USB 2.0 preferred). | | "Only one IMEI shown" | Your device has a single modem. For dual SIM, ensure "Dual IMEI" is checked. | | "Checksum Fail" | The firmware is corrupted. Re-flash stock ROM using SPD Upgrade Tool first. | | "Device still shows null after success" | You powered off too early. Wait for the phone to reboot automatically. If not, manually reboot twice. | Troubleshooting: If you get "Write Failed," try switching
Beyond just IMEI writing, the tool offers comprehensive NV item handling:
