Long story short, my friend was contacted by a debt collector about an old credit card debt(older than 6yrs which is the statute of limitations). I know they can not sue you after 6yrs, but he messed up and made a partial payment to them of $50. In Colorado does this reset the statute of limitations? I know in Colorado a verbal acknowledgement of debt does not reset it.

I know it generally does but all states are different, so I thought I would ask.

I found this but don't know if it applies.

From article 13 section 80

Indorsement of partial payment on note is insufficient. "Generally speaking, the rule is well established that the mere indorsement of a partial payment upon a note will not in and of itself toll the running of the statute of limitations." MacGinnis v. Pickett, 109 Colo. 169, 123 P.2d 410 (1942). ...
... upon plaintiff. In an action on a promissory note the burden of proving part payment so as to remove the bar of the statute of limitations is upon the plaintiff. Manby v. Sweet Inv. Co., 78 Colo. 371, 242 P. 51 (1925); ...