Brother MFC4820C Service Manual page 206

Downloading firmware
After the installation procedure of the Downloader driver, proceed to the firmware download.
If the driver has been installed so that you start from downloading firmware, turn off the facsimile
machine and then turn it on while holding down the 5 key. (The machine should show the black
and white pattern on the LCD.)
NOTE: Never unplug the power cables of the facsimile machine and your PC or the USB cable
during downloading.
(1) Run "Filedg32.exe."
The Filedrgs window will appear as shown below.
(2) Drag and drop the firmware (e.g., LZ0023_T.upd) onto the "Brother MFC-4820C USB
Printer" icon in the Filedrgs window.
NOTE: Use the de-compressed firmware file. The compressed file is in auto de-compression
format, so run the EXE file to de-compress.
During downloading, the machine sounds pip-pip intermittently. It will take approx. 2 to 5
minutes to complete downloading.
Upon completion of the downloading, the facsimile machine automatically reboots and returns
to the standby state.
(3) Press the * and # keys at the same time when the machine is on standby. The firmware version
appears on the LCD.
In this example, if "T0211252244:457C" appears, it means that the downloading has been
successfully finished.
(4) If downloading finishes abnormally, turn the facsimile machine off and on. The machine
automatically enters the download mode and issues large pip-pip sound. Perform the
downloading procedure above again.
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