Here’s a very short guide on how to restore IMEI on your Redmi Note 4X device.

Restoring IMEI on Xiaomi Redmi Note 4X Snapdragon

  1. Extract NON-HLOS.bin file from official ROM.
  2. Copy extracted NON-HLOS.bin to the adb/fastboot folder.
  3. Boot your device into fastboot mode.
  4. Connect your device to PC
  5. In the folder with adb/fastboot tools press “Shift” key + right mouse button and select “Open command window here”.
  6. Enter these commands in order:
    Fastboot devices
    Fastboot.exe erase modem
    Fastboot.exe flash modem NON-HLOS.bin
    Fastboot.exe reboot reboot phone
  7. Check your IMEI. It should be restored now.