Brother MFC620CN Service Manual page 370

(3) MFC620CN/425CN/420CN/410CN/215C/210C and FAX2440C
Press the * and # keys at the same time when the machine is on standby. The firmware version
appears on the LCD.
DCP315CN/310CN/120C/117C/115C/110C
Press the Menu and Mono Start keys. Next press the
enter the maintenance mode.
Press the key several times to display 8 on the LCD and then press the Set key. Again press
key several times to display 0 and press the Set key. (See
the
Press the Mono Start key several times to display the firmware version.
In this example, if "A0307252244:CF30" appears, it means that the loading operation has been
successfully finished.
(4) If loading operation finishes abnormally, turn the machine off and on. The machine
automatically enters the load mode and emits a large beep. Perform the loading procedure
above again.
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key four times to make the machine
Chapter 8, Section 8.5.21.)
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