Challenges/perks

Hey, I recently used a rank hack (trainer) and used to get lvl 70 and unlocked all perks and challenges. But I did not like it so i changed my rank to lvl 1 again.

And the challenges all say done and I can't seem to reset them (don't know how to.

so I can't unlock wepon attachments which out the challenges.

Could someone please help me with this?

~
Dom.

here you are:
http://www.mpgh.net/forum/227-cod-mw...nk-lv-1-a.html