Brother MFC-J2320 Service Manual page 244

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
key lights, release
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
display the following pattern.
, plug the power cord into an electrical outlet. When the
and immediately press
4-4
once to display the following
for
once to
two times to
three times to
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