NightHawk M2 setup as fail over

Hi all,

Just got this NightHawk M@ to setup as a failover for when my ADSL drops.

Trying to connect it to a Billion BiPAC 8900AX-2400 as the 3G/4G/LTE but I cannot seem to get it to work.

It is plugged into the USB port but the router just does not see it, or if it does, does not recognize it as a 3G router.

Am I missing something?

Cheers