if you are looking for an upgrade to evdo rev.a and gps I would use the official htc sprint upgrade. Since I noticed your on sprint.
Here
http://www.htc.com/us/FAQ_Detail.aspx?p_id=75&act=sd
Just connect to a computer and run the exe file that is downloaded from the htc site. More detailed information on installation and specs on the rom are on that webpage I linked to.