C7100 Imei | Repair

The Ultimate Guide to C7100 IMEI Repair: Fixing Null, Invalid, or Corrupted IMEI Numbers

Scenario A: Samsung Galaxy S7 / S7 Edge (Most Likely Intent)

If you are looking to repair the IMEI on a Galaxy S7 Edge (or the S7 Active, which creates confusion with the 'c' or 'i527' model numbers), the process generally involves the following tools:

Step-by-Step:

1. Install Qualcomm USB Drivers and QPST 2.7.496.
2. Enter Diag Mode on C7100:
   • Dial *#*#717717#*#* (some models) or use ADB: adb shell setprop sys.usb.config diag,adb
3. Open QPST Configuration → Verify your C7100 appears under "COM Ports."
4. Launch Software Download → Backup tab → Save QCN as .qcn.
5. Edit IMEI using QXDM Professional:
   • Open QXDM → Connect to the same COM port.
   • In "Command Output", type:

     spc 000000
     

   • Then:

     nv_write_item imei1 123456789012345
     

     (Replace with your actual IMEI)
   • For dual SIM: nv_write_item imei2 987654321098765
6. Restore the edited QCN through QPST's "Restore" tab.
7. Reboot. Dial *#06# to confirm.

Warning: Writing incorrect NV items can hard-brick a Qualcomm device. Proceed only if you have a full QCN backup. c7100 imei repair

Method A: Using "IMEI Changer Pro" (Root)

1. Install IMEI Changer Pro from a trusted APK source.
2. Grant root permissions.
3. Manually enter the original IMEI numbers.
4. Apply. Reboot.

Part 7: Common Errors and Fixes

| Error Message | Cause | Solution | |---------------|-------|----------| | S_BROM_CMD_STARTCMD_FAIL | USB driver issue | Reinstall MTK VCOM drivers, disable driver signature enforcement. | | Write IMEI fails – NVRAM full | Corrupted NVRAM size | Use Miracle Box to format NVRAM first. | | Baseband Unknown | Lost modem firmware | Reflash stock firmware (only modem.img or NON-HLOS.bin). | | Invalid IMEI after repair | Checksum mismatch | Use Miracle Box’s “Fix Checksum” option. | The Ultimate Guide to C7100 IMEI Repair: Fixing