I just bought a used card with "r4i-gold.eu" v6.2 on it, with 8gb micro (SD?).
Don't know what updates are on it, but day 1 it works on 3DS XL v8.1.0-19U and a DS lite.
Plays DS games. (not 3ds games(?))
Loads as Bomberman.
Tight fit in the 3ds xl, Does not spring back out and has to be pried out gently with a hard slim object. This will un-glue the side of the cart eventually, just like mine.
Better used on non-3ds models where it fits perfectly.