Brother HL-3040CN Service Manual page 345

(3) Click the "Brother Maintenance USB Printer" icon to select. Drag the necessary firmware
program file such as LZXXXX_$.upd and drop it.
Note:
After rewriting Sub firmware (GDI or PCL/PS) or Main firmware is completed, the
machine returns to the ready state. To continue rewriting the other program files,
turn off the power switch of the machine, and turn it on again while pressing the
Go and Cancel buttons at the same time. Check that "
the LCD and start rewriting.
(4) Upon completion of rewriting, the machine restarts and returns to the ready state
automatically.
6-8
" appears on
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