I know how to unlock. It's through
fastboot oem unlock.
I know why the manufactures place a lock. It's for security reasons.
But what is the lock? Is it a file in the system, saying "Hey, the bootloader is locked! Delete me if you want to unlock!", or a registery key, or an appsetting?
Or is it possible to unlock without running "fastboot oem unlock", can I send the unlock command by myself without using "fastboot oem unlock"?