I just flashed the stock JPU firmware using Odin. Everything seems to have gone according to plan, except that i've now got no internet access on my phone. I've tried both mobile 3g and wifi to no avail. Wifi/3G is showing as connected, but no data is being sent or received. What could be the problem? I'm a bit of a novice when it comes to flashing new firmware.
Sounds like you need to add the APN settings for your provider.
Yes, I'd agree.
Menu button | Settings | Wireless & Networks | Mobile Connections | APN (click that line).
Then follow the instructions provided on the Geekzone Android forum. There's a sticky note there with all the APN's for the NZ Carriers.