Ubiquiti UniFi UK-Ultra

→ Install OpenWrt (generic explanation)

1. Device get IP address from DHCP. If no DHCP, device will default to 192.168.1.20
2. Login inside the AP with ssh ubnt@ip_address (password ubnt)
3. Download sysupgrade firmware to /tmp (OEM fw is based on OpenWrt so there is no factory variant)
4. Rename the firmware image to firmware.bin
5. Disable the write protect:

   echo "5edfacbf" > /proc/ubnthal/.uf

6. Write the sysupgrade image to kernel0 and kernel1:

   dd if=/tmp/firmware.bin of=/dev/mtdblock2
   dd if=/tmp/firmware.bin of=/dev/mtdblock3

7. Write the bootselect flag to boot from kernel0:

   dd if=/dev/zero bs=1 count=1 of=/dev/mtd4

8. reboot the device:

   reboot

Proceed to First Login

1. Hold in the reset button whilst powering on the device. Wait until the ring alternately flashes between blue and white constantly
2. The device will default to 192.168.1.20 listening for TFTP connections
3. From a TFTP client transfer the OpenWrt image to 192.168.1.20
4. Once the transfer is complete wait for the device to reboot

This AP-Pro documentation can be used also for UK-Ultra: Harder Soft-Unbricking a Ubiquiti Unifi UAP-Pro AP

Static and flashing can be configured as follows.

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

   echo 1 > /sys/class/leds/white\:dome/brightness
   echo 1 > /sys/class/leds/blue\:dome/brightness
   echo 0 > /sys/class/leds/white\:dome/brightness
   echo 0 > /sys/class/leds/blue\:dome/brightness

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

      echo timer > /sys/class/leds/white\:dome/trigger

   2. configure in /etc/config/system

See the UniFi page for how to flash the led based on network traffic.

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