Brother DCP-J4110DW Service Manual page 258

If the machine does not automatically enter the firmware loading mode, perform the following
procedure for switching to that mode and then load the firmware having an extension .upd.
1) While holding down the power switch, plug the power cord into an electrical outlet.
When the Home key lights, release the power switch and immediately press the power
switch once to display the following pattern.
2) Within three seconds after the above pattern appears, hold down the power switch for
approximately two seconds to display the following pattern.
3) Within three seconds after the above pattern appears, press the power switch once to
display the following pattern.
4) Within three seconds after the above pattern appears, press the power switch two
times to display the following pattern.
5) Within three seconds after the above pattern appears, press the power switch three
times to display the following pattern.
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