Brother MFC-J5335DW Service Manual page 259

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
LED power indicator lights, release
display the following pattern.
2) Within three seconds after the above pattern appears, hold down
approximately two seconds to display the following pattern.
3) Within three seconds after the above pattern appears, press
display the following pattern.
4) Within three seconds after the above pattern appears, press
display the following pattern.
5) Within three seconds after the above pattern appears, press
to display the following pattern.
, plug the power cord into an electrical outlet. When the
and immediately press
4-4
once to
for
once to
two times to
three times
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