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Since r23904 this device is supported in trunk and in future stable release.
At the moment it isn't part of any stable release!

1. Login inside the AP with ssh.
2. Find the image like "openwrt-ar71xx-ubnt-unifi-*-factory.bin" on openwrt binary repository and download inside /tmp.
3. Use the ubiquity fwupgrade utils to reflash it:

   fwupdate.real -m openwrt-ar71xx-ubnt-unifi-*-factory.bin -d
   

If you have already installed OpenWrt and like to reflash for e.g. upgrading to a new OpenWrt version you can upgrade using the sysupgrade command line tool. It is important that you put the firmware image into the ramdisk (/tmp) before you start flashing.

• Browse to http://192.168.1.1/cgi-bin/luci/mini/system/upgrade/ LuCI Upgrade URL
• Upload "openwrt-ar71xx-ubnt-unifi-*-sysupgrade.bin" file to LuCI
• Wait for reboot

• Login as root via SSH on your access point ip
• Use the following commands to upgrade:

  cd /tmp/
  wget http://downloads.openwrt.org/.../openwrt-ar71xx-ubnt-unifi-*-sysupgrade.bin
  sysupgrade -i /tmp/openwrt-ar71xx-ubnt-unifi-*-sysupgrade.bin
  

A male-strip is on board to connect your TTL capable serial converter. Use the following settings: 115200 8N1.

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How to connect to JTAG interface, and how to reflash the device with JTAG tools

See port.jtag for more JTAG details.

The UniFi ap has 2 leds, the orange one can be configured adding something like:

config 'led'
	option 'name' 'lan'
	option 'sysfs' 'ubnt:orange:dome'
	option 'trigger' 'netdev'
	option 'dev' 'br-lan'
	option 'mode' 'tx rx' 

Also its possible to change the led status manually.

1. static, use 1 for on, 0 for off:

   echo 1 > /sys/class/leds/ubnt\:orange\:dome/brightness
   echo 1 > /sys/class/leds/ubnt\:green\:dome/brightness
   echo 0 > /sys/class/leds/ubnt\:green\:dome/brightness
   echo 0 > /sys/class/leds/ubnt\:orange\:dome/brightness

2. blinking
   1. blinking on, interval 1000ms, orange led:

      echo timer > /sys/class/leds/ubnt\:orange\:dome/trigger
      echo 1000 > /sys/class/leds/ubnt\:orange\:dome/delay_on
      echo 1000 > /sys/class/leds/ubnt\:orange\:dome/delay_off

   2. blinking off:

      echo 0 > /sys/class/leds/ubnt\:orange\:dome/delay_off