Once you've flashed your unlock token, verify that it's been successfully applied by typing fastboot oem get_unlock_verify in the command prompt or terminal.
OnePlus devices utilize Anti-Rollback (ARB) mechanisms to prevent users from flashing older, insecure versions of the operating system. Messing with ARB indices can lead to a hard brick—a state where the phone is unrecoverable. please flash unlock token first oneplus better
Here is a guide to getting and flashing that token to fix the error. 1. Requirements for Unlocking Once you've flashed your unlock token, verify that
: OnePlus typically emails a .bin file within 7 days . Once you've flashed your unlock token
This is a security and carrier restriction. OnePlus requires users of specific carrier models to submit an application to receive a unique .bin file (the token) that "keys" your specific device for unlocking.