A friend of mine has the full update thing just before IOS37 : 3.2E wiiware under IOS36 etc. His Mario Kart never asked for update
From that and what your friend tested, it is absolutely safe for a PAL user update (or not) with Mario Kart PAL and use it. Only online update contains IOS37 for now.
From that and what your friend tested, it is absolutely safe for a PAL user update (or not) with Mario Kart PAL and use it. Only online update contains IOS37 for now.