The tool will detect the device, switch it to diagnostic mode, and write the IMEI. Look for a green notification. 2. Using ResearchDownload or UpgradeDownload
Click . Power off your phone, hold the Volume Down key, and connect it to the PC via USB.
The corrupted data usually resides in the NVRAM (Non-Volatile Random Access Memory) partition. To get your phone working again, you need to use a specialized method to write the correct IMEI number back to that partition.
If your SPD Android phone has a genuine IMEI loss after a software update or reflash: spd android imei repair code
Ensure your smartphone battery is charged to at least 50% before initiating firmware level changes to prevent sudden power failure during a critical write phase.
This article explores the methods and specialized tools to restore connectivity on your Spreadtrum/UNISOC device. Disclaimer: Legal and Ethical Usage
Installing a ROM or firmware file not explicitly designed for your exact phone model. The tool will detect the device, switch it
| Method | Difficulty | Tools Needed | Effectiveness | | :--- | :--- | :--- | :--- | | | Easy/Moderate | None (Phone only) | Low - works on few models | | WriteIMEI Tool (Windows) | Moderate | Windows PC, USB Cable | Medium - for most SPD devices | | Professional Boxes & Dongles | Hard | Paid hardware (e.g., Miracle Box) | High - for technicians |
The phone is not in the correct diagnostic mode, or the Android security patch blocks direct writing.
Enter the 15-digit original IMEI number found on the device's box or battery compartment. Select and restart the device to apply changes. Software-Based Repair Methods Using ResearchDownload or UpgradeDownload Click
Repairing or changing an IMEI is often necessary if the number becomes "Invalid" or "00000000" due to software corruption, firmware flashing, or a factory reset. For Spreadtrum (SPD) / Unisoc Android devices, this can be done via secret dialer codes or specialized PC tools. ⚠️ Important Legal Note
Carefully type your device’s original 15-digit number into the corresponding field. Double-check every digit for accuracy.
Download and extract the WriteIMEI Tool (versions like v1.5 or newer work best). Open the folder and run WriteIMEI.exe .