fastboot flashing unlock_critical
unless you have a full backup of all partitions (unlikely without root) and accept a 90% chance of bricking. The “UPD” lock is Sharp’s way of enforcing carrier security. For now, enjoy the Zero 2 as-is—it’s still a fantastic daily driver without root. unlock bootloader sharp aquos zero 2 upd
Unlocking can permanently break "Widevine L1" status, meaning apps like Netflix may no longer play in HD. fastboot flashing unlock_critical unless you have a full
If you want to keep data: