[tx_dbs_tx]

Yes you lose root. No big deal. Yes your phone will be put back like new out of box condition, including stock radios.

No sticky needed. Do this: download the 3.29 ruu from shipped-roms.com. Install htc sync from the htc sync folder that is preinstalled on your sd card. Copy the htc sync.exe file to your computer and install it. Leave your phone unplugged from the usb cable while installing htc Sync. Once done just plug in your evo to usb and run the ruu. Follow the prompts.