Go to Settings > About Phone > Software Information and tap Build Number seven times. Then, in Developer Options , enable USB Debugging and OEM Unlock . Recommended Professional Tools
Yes, if you use the correct original IMEI and proper tools. Using random IMEIs or generator tools can lead to permanent network bans. c7100 imei repair
Here are the top 3 reasons your C7100 IMEI became invalid: Go to Settings > About Phone > Software
Yes. SN Writer and Maui META are free for MTK. For Qualcomm, QPST is free. However, paid tools like Chimera offer one-click fixes. in Developer Options
: A popular choice for one-click repairs on MediaTek-based Samsung models. General Repair Workflow
Writing incorrect NV items can hard-brick a Qualcomm device. Proceed only if you have a full QCN backup.