An invalid or null IMEI on a Spreadtrum (SPD) SC7715 device cuts off all cellular network services. This guide explains how to safely use the dedicated IMEI repair tools for this specific chipset architecture. ⚠️ Important Legal and Safety Disclaimer
— https://bbs.16rd.com/citiao-xinpian-SC7715-data_download.html On this page, look for the file labelled “SC7715 IMEI Tool_.7z” (438.25 KB, updated 2017‑11‑04). The page also includes an SC7715 Download User Guide PDF that explains the usage. sc7715 imei tool latest version link
Changing an original IMEI to a different one is illegal in many countries. An invalid or null IMEI on a Spreadtrum
Check your Device Manager. If you see a yellow exclamation mark next to the device name, your SPD drivers are not installed correctly. Reinstall the drivers or try a different USB port (preferably a USB 2.0 port on the back of the PC). Write Timeout / Failed Error The page also includes an SC7715 Download User
: IMEI modification can sometimes cause data loss or "Invalid IMEI" loops if not done correctly.
| Component | Minimum Specification | |-----------|----------------------| | OS | Windows 7, 8, 10, or 11 (32-bit or 64-bit) | | RAM | 1 GB | | Processor | Intel/AMD from 2010 onward | | USB Port | USB 2.0 or 3.0 | | Drivers | SPD (Spreadtrum) USB Drivers v1.5 or higher | | Admin Rights | Yes (required for driver communication) |