One of my customers is running a Vigor2850n in one office (and Vigor2860n's in the other two offices).

The 2850 is running the latest firmware (3.6.4) and I would like to know if it is in any way compatible with any 4G USB modems?

The primary WAN connection has to use the WAN2 port because it's a FTTC connection and won't work without BT's little white box, which means I can't plug a 4G router into WAN2 at the same time.

Many thanks,
Steve

The latest firmware for the 2850 is 3.6.6. It's actually on the FTP site. 232201 is the one that needs using.

Also, as far as I'm aware, the 2850 won't be able to have 4G function on it. Only he 2830 and 2860 will (out of the 28xx series).