Xiaomi devices using MTK processors (such as the Redmi Note series) store identification data in specific partitions like , NVDATA , and PROTECT1/PROTECT2 . If these partitions are wiped during a firmware flash or "brick" event, the device loses its IMEI, resulting in "Invalid IMEI" or "No Service" errors. 2. Common Tools Used

: A free alternative often used for fixing IMEI on both SPD and MTK chipsets. Physical Repair Tool Kits

: A popular subscription-based tool that supports bootloader unlocking and IMEI restoration for a wide range of Xiaomi MTK models. Key Considerations

Samsung, Android 13, IMEI Repair + Patch Certificate with Chimera