Brother MFC Series Service Manual page 301

<Rubber key panel model>
(1) Press Menu.
(2) Press [ ] or [ ] to choose [Initial Setup]. Press OK.
(3) Press [ ] or [ ] to choose [Reset]. Press OK.
(4) Press [ ] or [1] or [ ] to choose [All Settings]. Press OK.
(5) Press [ ] or [1] to choose [Reset].
(6) Press [ ] or [1] to reboot the machine.
App. 2-2 Confidential