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| Feature | EFS Reset Tool | | :--- | :--- | | | Fix "Baseband Unknown" & "Null IMEI" | | Risk | High (Permanent brick of cellular radio) | | Requirement | Root or Factory Box (Jtag) | | Cost | Free (XDA) to $200 (Hardware Box) | | Legal | Legal for repair; Illegal for IMEI changing |
Don't touch the EFS reset tool unless you have a full backup on your SD card and cloud storage. efs reset tool