How can i unroot my htc evo 4g gingerbread 2.3.3?

view full story

http://androidforums.com – I have an Htc Evo 4g it is running on original stock rom gingerbread 2.3.3 and i am trying to unroot it. It is rooted to Revolutionary and it has clockwork installed. I am trying to unroot because it has sooooo many problems, and it wont let me receive calls sometimes, it is very slow, and i just want to take it off my phone that i can bring it back to sprint for the vibration problem. If my phone gets switched out i may consider rooting again if i can get wifi tether again. If anybody knows how to unroot the htc evo 4g running original stock rom 2.3.3 gingerbread please help. :) (General)