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If your C7100 runs on a MediaTek (MTK) processor, you can often restore the IMEI directly from the device without a computer. Open the phone dialer on your C7100.

Repairing the requires specialized tools and careful steps. The safest method is using professional tools like Chimera or Octopus. Always ensure you are using the original IMEI number to avoid legal issues.

Here are some general steps that might be involved in repairing a C7100 IMEI:

Install CPU-Z or Device Info HW from the Play Store. Look for "Processor" or "Chipset."

Locate the "Repair" or "IMEI Repair" option.

If SN Writer fails with "S_DL_GET_DRAM_SETTING_FAIL," you need a scatter file. Use Miracle Box or UMtool instead.

Uncheck system and data partitions. Select only the NVRAM , NVDATA , or EFS partitions.