Check device connection:
fastboot oem UPD_get_unlock_info This returns a hash. Copy that hash. You will need it for token generation. Here is where the UPD part matters. Standard fastboot oem unlock will return: unlock bootloader sharp aquos zero 2 upd
If you are searching for the keyword , you are likely at a specific stage of this journey. "UPD" typically refers to Update Packages or Fastboot UPD commands used in Sharp’s proprietary flashing protocol. unlock bootloader sharp aquos zero 2 upd
adb reboot bootloader Once in bootloader mode, verify fastboot: unlock bootloader sharp aquos zero 2 upd
fastboot oem device-info Look for: (bootloader) Device unlocked: false