Boot the device into Diag Mode (often by holding specific volume buttons while connecting via USB) and confirm it appears in the PC’s Device Manager.

Last updated: May 2026. Versions and links verified at time of writing.

To fix a corrupted or "Invalid IMEI" error on a Spreadtrum (SPD) chipset device, using the is often the most effective solution. This utility allows users to write or restore the original IMEI of their smartphone via a PC. Key Features of the SC7715 IMEI Tool