Amplifi HD router stuck on boot up loading screen

jt_IT

I bought this Amplifi HD router and it worked for about 3 hours and downloaded the latest firmware before going offline and then restarted. But then it got stuck in the booting up animation and refused to initialise.

Steps I used to resolve this:

Factory reset (used a paper clip to press the button at the bottom for 10 secs)
Disconnected all cables for 5 mins and connected to power. Still stuck on loading screen
Attempted recovery mode but it asked for a firmware file (which seems to not be available anywhere)

I have not started the RMA process or support as I bought this off eBay (it was sealed and brand new).

Is there anywhere (or some one) to get the firmware to attempt to recover this device?

Thanks