Possible to delete completed challanges?

Hi all, i was wondering if i could reset challanges so i could do them again because i used Melodia's trainer to unlock everything *probly shouldnt of done that* anyway if any1 has a solution thank ye much

If you want to do everything over go to steam right click cod 6 multiplayer and hit delete local something.
If you don't prestige
If this helped thank me

And I think in melodias trainer if you click the red button behind the unlock all button it rewinds it.
I'm nit sure if this is acctualy possible

But in pse you can do this I'm sure of that.
If you don't know what pse is google and koeninatorrr are your best friends

meeeeeeeeee dont double-triple post please, its against the rules.
still good of you that u are trying to help.

for the threadstarter: yeah resetting your stats is the only solution atm.
you can find a link to a guide which tells u how to reset your rank in my signature.