Same for me! Have a european DSi XL since yesterday. Acekard2i (Akaio 1.6, 1.4ready) don't work at all. DSi XL is reporting an error!
Check your cart isn't a clone and check it works fine on a regular DSi.
RupeeClock's posts you quoted have already been ruled out as being a contact issue, and did indeed work on the DSi XL
QUOTE(RupeeClock @ Mar 5 2010, 03:38 PM) Ah, it looks like I should apologise.
I went back to Gamestation when I noticed some marks on my Acekard's contacts, to try the DSi XL again.
We were actually able to get it to work, it looks like there was actually a contact issue with my card, as it would crash most of the time.
Yet it usually runs without problems in my DSi, maybe the DSi XL slot is marginally different.
So, looks like I might just have to buy a replacement AK2i, lol.