SigmaKey works best when the phone is in Manufacturing (Manufacture) Mode or Fastboot. The JNY-LX1 typically requires Bootloader unlock first. If your bootloader is locked, Sigma may not write the IMEI.
This article is for educational and professional repair purposes only. Repairing an IMEI means restoring the original factory number that was assigned to that specific motherboard. Writing any number that does not match the phone's original label is considered IMEI forging and is punishable by fines or imprisonment in many countries. Always ask for proof of purchase before performing this service for a customer.
| Error | Solution | |-------|-----------| | "Handshake fail" | Wrong COM port mode. Ensure it's "Huawei COM 1.0", not fastboot. Re-do testpoint. | | "Credits required" | Your Sigma license needs Huawei credits. Purchase inside Sigma. | | "Device locked" | You forgot to remove Huawei/Google accounts. Factory reset and remove accounts. | | "IMEI invalid" | Checksum error. Re-type the 15 digits carefully. Last digit is a checksum – Sigma auto-corrects. | | "No service after repair" | You may also need to repair the NV data or flash stock firmware via dload method. |
| Error Message | Solution | | :--- | :--- | | "Handshake error" | Reinstall Huawei USB drivers. Try a different USB port (USB 2.0 preferred). | | "Bootloader locked" | You cannot write IMEI on a locked bootloader for JNY-LX1. Use Sigma's "Bootloader Unlock" function (paid credits may be required). | | "Write failed at address..." | Ensure you are in Manufacture Mode, not standard Fastboot. | | "No IMEI after reboot" | Perform a factory reset from recovery (Huawei Recovery -> Wipe data/factory reset). |
| Error | Solution | |-------|-----------| | Handshake failed | Reinstall Huawei drivers; use USB 2.0 port | | Partition write fail | Unlock bootloader first (if required) | | IMEI reverts after reboot | Write to both OEMinfo & NVRAM (Sigma option) | | Device not in DB | Update Sigma to latest version (v2.11.xx or newer) |
Once connected, do not click "Repair IMEI" immediately. First, perform a Full NVRAM Backup.
Now, proceed with the repair:
