Brother NC-4100H - Manual (Page 164)

APPENDIX
APPENDIX-6
Reloading process
The Data LED on the printer front panel will blink during the firmware file loading
process and then Alarm LED will turn on and the Ready LED will blink during the
programming process, and the printer will restart automatically after the
programming has completed. DON'T TURN OFF THE PRINTER DURING THESE
PROCESSES.
If the Data LED does not stop blinking after about two minutes, or Alarm and the
other LED blink periodically, check to make sure that you correctly entered all
parameters and that your network connections are good. Then power the print
server/printer off and then on again, to retry the download.
If you encounter problems upgrading the firmware and you find that the network
portion of the printer no longer functions, you should try re-programming the print
server by using the COPY command from the DOS prompt of your PC. To do this,
connect a parallel cable between your PC and printer and use the command "COPY
filename LPT1:/B" (where filename is the new firmware file). Please note that it is
not possible to upgrade the NC-2000 series firmware using the COPY command. For
NC-2000 series print servers please use BRAdmin or the TFTP protocol for firmware
upgrading.