Default htc one v : cant go to hboot menu

Hello everyone, i just got a htc one v from my friend. after a few apps, i noticed it started to slow down and hang a lot so i decided to root it. My problem is that i cant get to hboot menu. i power off my phone (battery is almost full) then i press and hold "down" volume and power button together but nothing happens. it simply reboots like normally.i have gsm btw. i have included some software info in the attached pics. please help me..

thank you