Accidentally upgraded 1.1.1 to 1.1.2 and then back down to 1.1.1

Modem firmware is now 04.02.13G and I suspect that is why I'm seeing my network, logging on, but absolutely NO INTERNET. I have reset wifi router, etc. I have erased all settings on the phone. No dice.

I keep reading about a baseband downgrade, but it looks ridiculously complex.

HELP!!!!!!