: Assists in writing calibration data necessary for network signal stability. 📥 Download and Requirements

Modern Windows versions (10 and 11) block unsigned legacy Spreadtrum drivers. You must disable this feature via advanced startup settings before installing the drivers. 2. Install Spreadtrum (SPD) USB Drivers

To fix an invalid IMEI on a Spreadtrum SC7715 chip, you must use specialized software capable of communicating with the phone via while the device is in Calibration, Diag (Diagnostic), or Boot mode. 1. SPD WriteIMEI Tool (Recommended)

Repairing an invalid, null, or zero IMEI on a Spreadtrum SC7715-powered mobile device requires the correct flashing software and compatible USB drivers. This comprehensive guide provides the direct download information, prerequisites, and step-by-step instructions needed to restore your device's network connectivity safely. ⚠️ Important Legal & Technical Disclaimer

Can write IMEI1 and IMEI2 simultaneously for dual-SIM devices.

Extract the ZIP archive to a folder on your local C: drive to avoid path errors. Right-click WriteIMEI.exe and select . Step 2: Configure the Settings

The tool will display a green or Success notification within a few seconds.

Disconnect your phone, cycle the battery, and power it on. Verify by dialing *#06# . Troubleshooting Common Errors Tool Stuck on "Waiting for Phone" or "Checking COM Port"

Open the extracted folder and run the Sc7715_IMEI_Tool.exe file as an Administrator . Enter IMEI Numbers: In the tool interface, enter your 15-digit IMEI 1. If your device has dual SIM, enter the 15-digit IMEI 2.

: Capable of writing both IMEI 1 and IMEI 2 simultaneously.

Installing mismatched or poorly compiled stock ROMs.

Flashing NVRAM data can sometimes wipe user partitions. Backup important data.

: Under the Port tab, select the COM port number identified in step 2.

This is the most critical physical step. You must connect the powered-off phone in a way that triggers the Spreadtrum BootROM.

Choose Normal Mode from the "Mode Select" menu.