Any way to save Challenges?

[Slavik]

I did my self prestige 10 and was in it for over a month,now i finished a lot of challenged like 80% of them and now i want to change my prestige to 7 or 9
but when i do it it wont save,unless i delete some files and that means resetting challenges..
any way to save challenges? or a hack that finishes them all? (a legit hack that finishes the challenges like they are, not IX or 0 kills with X..)

[Lizanje]

Dont think so..
But if u want the lvl 70 prestige 10 then just use EA

[kickindrummerkid]

I can save anything, I found all the offsets for all the challenges, learn how to hexedit.