: Frequently used to back up NV data, unlock the bootloader, and flash the MDM-free firmware.

: Disabling these settings helps maintain the "permanently" unlocked status of the device. Where to Find Firmware and Tools

: Check the IMEI status. If it is missing or corrupted, restore the previously made NV backup. Preventing Re-Locking via OTA

Once the MDM is bypassed, it is critical to disable automatic updates. If the device downloads a new official OTA update, the MDM lock may be re-activated.

: Use a tool like UnlockTool to flash the MDM-specific firmware. Some methods require formatting all partitions and then downloading the new firmware.

Several methods and tools are used by technicians to clear MDM locks on the CPH2557 model: