I have tried to flash my pico2 HP devices (I got 4 for a steal..) via AirOS; says bad image file.  I tried to tftp via this process below, and says bad file..  <this is the file I am trying to use bbhn-1.1.2-ar71xx-generic-ubnt-bullet-m-squashfs-factory.bin>

1. Set your PC to be able to access the bricked unit and prepare the firmware file:
2. Prepare your TFTP client to push the firmware.bin file so you can start it with just a hit of a button. Do not start the push yet.
   • Using the Windows integrated TFTP client the command to prepare is: "tftp -i 192.168.1.20 PUT [path to file]\firmware.bin"
3. Unplug the bricked unit.
4. Plug the LAN connection of the PoE injector directly to your PC's NIC.
5. Keep the unit's reset button depressed and plug in network/PoE in the unit.
   • Keep the reset button depressed until you see the light cycling relatively fast through amber/green/off colours (~14 seconds from power on) -> Release it. Now the device is in TFTP transfer mode.
6. Engage the TFTP push command and wait. The device will write the firmware and it will reboot.
   • If you wait too long to start the tftp, the push will not work as the device will stall. Please redo from step 3.

The firmware only supports M-series UBNT devices. Andre, K6AH

well there you go!  Is there any futures for this device being supported?  BTW, awesome news on the 5 Ghz support!!