• svn co svn://svn.openwrt.org/openwrt/trunk/
• cd trunk
• ./scripts/feeds update -a
• ./scripts/feeds install -a
• make menuconfig
• Target system is: Atheros AR71xx/AR7240/AR913x
• Subtarget is: Generic
• Target Profile is: Ubiquiti RouterStation Pro
• make

• Connect your computer to the WAN port
• Configure your network like this: 192.168.1.1/255.255.255.0 (anything but 192.168.1.20)
• Plug in your RouterStation Pro
• Press the reset button and hold it for about 10 seconds (you should see the third led flash a bit and the second on come up)
• You should be able to ping 192.168.1.20 now
• Send the firmware image with tftp in binary mode:

$ tftp 192.168.1.20
tftp> binary
tftp> put openwrt-...-factory.bin

• Install swconfig then:

swconfig dev eth1 set reset 1
swconfig dev eth1 set enable_vlan 1
swconfig dev eth1 vlan 0 set ports '0 1 2 3 4'
swconfig dev eth1 set apply 1

• Ubiquiti official page
• Ubiquiti wiki page

• OpenWRT page
• DebWRT - Debian on embedded device!
• FreeBSD
• pfSense