Hello everybody as of today this is the easiest way that i have found to unroot the HTC EVO enjoy
1. Download HTC Sync and the Original RUU and save it to your computer.
HTC SYNC
Application - HTC Sync 2.0 for HTC Magic、Tattoo、 Hero (Android 1.5)
ORIGINAL RUU
Shipped ROMs
2. Install HTC sync from the link above.
3. Plug your phone into the computer via USB cable and select HTC Sync when prompted on the phone on how it should connect.
4. Install the Original Ruu from the link above.
5. enjoy your unrooted phone