Many users see "Review Successful" in the app and immediately jump into Fastboot. However, it can take time for the device's internal flag to sync with the server’s approval.

You see this after typing fastboot oem unlock or fastboot flashing unlock . Your heart sinks. You’ve enabled Developer Options, turned on OEM Unlocking, and booted into fastboot mode. Yet, the phone refuses to unlock. Instead, it tells you your serial number doesn’t match.

: The system checks the device serial against a server-side "allowlist" before permitting Fastboot access; if it doesn't match, the verification fails .