Have you already tried dialing ##72786# from your phone dialer, then choosing reset from the menu when it pops up? If not, try it and see if it gets things working again, then update your profile and PRL. You can also do ##3282# but you'll need your MSL, which Sprint should give you if you ask for it. There isn't really a way to uninstall the software update since you're not rooted, at least not that I'm aware of.
For more info, take a look at the thread in the link below:
Sent from my HTC device