If you provide the exact brand and chipset (MediaTek/Qualcomm/Spreadtrum) of your C7100, I can guide you toward legal firmware restoration methods—but not IMEI changing tools.
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: c7100 imei repair
Professional tools such as Z3X , Chimera , or Octoplus are the gold standards. Some technicians even use free scripts or SN Writer for MediaTek-based variants. If you provide the exact brand and chipset
: Often used for older or specific Samsung regional variants. General Repair Workflow c7100 imei repair