Yes. SN Writer and Maui META are free for MTK. For Qualcomm, QPST is free. However, paid tools like Chimera offer one-click fixes.
You may need to restore a known good NVRAM backup via SP Flash Tool, then write IMEI.
The "C7100" typically refers to a range of rugged devices (often from brands like Blackview or Ulefone) or specific industrial handheld terminals running on MediaTek (MTK) or Qualcomm chipsets. One of the most frustrating issues users face after flashing firmware, performing a factory reset, or installing a custom ROM is IMEI corruption. c7100 imei repair
When the IMEI (International Mobile Equipment Identity) is damaged, your device may display:
This article provides a comprehensive guide to C7100 IMEI repair, covering the causes, preparation, software tools, and step-by-step procedures to restore your device's network functionality. This article provides a comprehensive guide to C7100
Repairing the IMEI on your own C7100 is completely legal. You are restoring the original, manufacturer-assigned number.
However, changing an IMEI to a different number (cloning), or writing a fake IMEI to evade a blacklist, is a federal crime in most countries (including the US, UK, and EU nations). This article is for repair only—not for fraud. Always use the IMEI printed on your original device box. Repairing the IMEI on your own C7100 is completely legal
Success: A green circle will appear with "PASS." Disconnect the phone and reboot it.