1. Set the RCXTTY environment variable to point to the port where the communication tower is plugged in:

   	bash# export RCXTTY=/dev/usb/lego0
   

   if you are using the USB tower, or

   	bash# export RCXTTY=/dev/ttyS0
   

   if you're using serial port 1

    

2. Go to the util directory where you installed brickos. Turn on the RCX, place it adjacent to the tower and type:

   	bash# firmdl3 ../boot/brickOS.srec
   

   and you'll get something the following, which will slowly count up to 100%:

   	Transferring "../boot/brickOS.srec" to RCX...
   	 32%
   

   and then the firmware is all downloaded.

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