we're not thinking you have corrupt firmware.. that would not boot and you would not be able to access the interface (when not plugged into the bike, just powered by USB)
When you use the GS-911 utility (for PC or MAC) and connect the GS-911wifi over USB, then check for updates.. This does not need your GS-911wifi to be connected to a network.. only the PC needs internet access..
Once that's up to date, then that's not the issue.. then the problem lies between your GS-911 and the bike...
I've used the GS-911wifi on both the GTL as well as the GTL Exclusive.. without any problems.... - so I'm pretty sure we can get you sorted!
Firstly let's make sure that you're using the correct connector... the K1600 has caught a couple of people out..
http://www.hexcode.co.za/products/gs-911/support/how-tos/how-to-loacate-the-diagnostic-connector-on-your-bmw-motorcycleThen as a next step, just power the GS-911wifi from your PC using USB - Use the utility to make sure you can open a browser to it - this means your wifi is set up correctly and the GS-911 is working correctly (i.e. you can browse the interface, Main screen, About screen, view the models/Series etc...)
if all of the above work, then we take it a step further...
best
Stephan