...however - with a bit of searching I found that there was a solution out there:
What I did was Went to Setup > USB Settings > switch "SharePort" to "WCN Confirguration" > reboot (router)
Then go back to Setup > USB Settings > switch "WCN Confirguration" back to "SharePort" > reboot (router)
Seriously. Just cycling through the settings worked. How sad is this?
Anyway - if your dealing with the Firmware fail - that's all you've got to do!