You will see a warning on your phone screen. Use the Volume Keys to select "Unlock Bootloader" and the Power Button to confirm. Step 5: Verification
Firmware packages labeled “UPD” usually come from (e.g., au/KDDI, SoftBank). These builds lock the bootloader tighter than global versions. Attempting standard fastboot oem unlock will likely fail with a remote: Command not allowed error. unlock bootloader sharp aquos zero 2 upd
