Brother HL-5340D Service Manual page 267

1.1.2 Rewriting the firmware
After the installation procedure of the Brother Maintenance USB Printer driver is completed,
refer to the following steps for the detailed procedures to rewrite the program files. If the
Brother Maintenance USB Printer Driver has already been installed to your PC, start to
rewrite the program files.
<Procedures>
(LED model)
(1) Connect the PC and printer with the USB cable.
(2) Turn the power supply of the printer on while holding down the [Go] button and the [Job
Cancel] button. Make sure that all LEDs are on. The yellow Status LED lights up when
releasing the [Go] button and the [Job Cancel] button. Press the [Go] button for five
times (Main Firmware) or six times (Net Firmware). A few seconds later, the printer goes
into the ROM rewriting mode.
Note;
• If the error rewriting the firmware occurs, press the [Go] button for eight times to
rewrite the firmware again.
• Press the [Go] button within 2 seconds after releasing the [Go] button and the [Job
Cancel] button. Return to the ready state automatically if no operation is
implemented within 2 seconds.
(3) Start the PC.
(4) Open the "hl5300" folder and double-click the FILEDG32 icon to start. Make sure that
there is the "Brother Maintenance USB Printer" icon, and that no error occurs.
(5) Click the "Brother Maintenance USB Printer" icon in FILEDG32 to select.
(6) Drag the firmware (LZ·········.blf) in the same folder and drop it onto the icon of the
Brother Maintenance USB Printer in FILEDG32. The files in the firmware are sent to the
printer so that they are started to write into the flash ROM automatically. After finishing
receiving the files, the printer starts to rewrite the firmware.
6-5 Confidential