doing a hard reset will restore your rom to factory defaults and then run all the software in the ExtRom to customize it for your particular carrier. Since you just got it, it probably already has the current official Sprint rom that came out in November, but you might want to check to be on the safe side. The location for the official rom hosted on UTStarcom's site is
http://www.utstar.com/pcd/downloads/...0_WWE_Ship.exe
Running that will restore your rom to the current officla build. Beyond that, you might want to check out runnind Wideawake's custome AKU 2.2beta2 rom and see if you like it.