@7hir7een: Hmm, quick question, what's the default mapping for the top button? Backward or Forward?
(I'm looking at a K4 and it was Backward, but looking at the KOA code and what you've logged, it looks like Forward, unless they inverted the keycode between the KOA and the KOA2...)
EDIT: Looked at the KOA2 user's guide, it's indeed in the reverse order than on a K2/K3/K4, so, all's good

. (i.e., top is forward).