Yes, extender/repeaters connect wirelessly, but I looked through your router's manual and it looks like it doesn't have the capability to be used as a repeater. You'll have to use a different router...

It looks like the Jetpack is a Wi-Fi router itself (as well as a 4G modem), so you'd probably only be able to use it with your C1200 by using your C1200 as an extender/repeater.

Hmm, weird. Have you written to customer support to ask about it? Maybe there's something in the firmware that prevents both SmartConnect and channel choice.

Do you have SmartConnect turned on? You should be able to make changes once you turn that off, then you can turn it back on once you have finished your changes. That's how it is on the C5400 anyway.

Your keyboard is probably putting an automatic space into your password and passwords can't have spaces, so they show up as red. Happens on the Web browser login, too. Try back spacing to delete the...

I would try saving your router settings, resetting to factory defaults, and manually setting up the router to just have your SSID and password, then try to connect to iTunes and Windows Update. If it...