Schedule an appointment at an Apple Store or Authorized Service Provider.
While often free for the original owner with a receipt, some regional providers may charge a service fee if the device is out of warranty. Set a firmware password on your Mac - Apple Support remove efi firmware password macos
Extremely high. One wrong byte can permanently brick the logic board. Requires soldering or a pogo-pin jig, advanced electrical engineering knowledge, and model-specific firmware dumps. Schedule an appointment at an Apple Store or
When the lock icon and password field appear, . advanced electrical engineering knowledge
If you have forgotten the password, Apple does not provide a software "reset" button. You must seek professional assistance.