new to this setup acekard 2i on label & DSi setup

hey guys i recently bought an Acekard 2i & DSi from a friend and wanted to know a few questions1. how can i tell if my Acekard 2i is a fake or clone?
2. when in the menu for the Acekard there is a brightness setting but it doesnt do anything, is the cart messed up or is it different than the DS original & lite?