It could either be the MSD card itself or the reader. Try a different reader first, and if that doesnt work, you'll need to get a new MSD card.
You'll probably need to get another MSD card then. I don't think this was the acekards fault, as I have never heard of this happening because of it. MSD cards can be defective and stop working sooner than they normally would. MSD cards are easy to find, most electronic shops should have them. Try to get a Class 4 or higher card.
Like I said, most likely was defective. Unless both readers are bad.... Where did you get the readers and what brand are they?
lol this is the same thing that happened to me i just returned my acekard and exchanged it to an r4i DAMN! (if only i knew)
Hi, I found this thread on ak2i so I decided to post here my problem with this flashcard. Now, I've just received my card, but it doesn't seem to work with any firmware! It's really frustrating, I've tried both AKAIO and the official one (i tried 4.21 version but it didn't boot so I got the older 4.17 but I'm still getting the error message at the boot). My DSi firmware is 4.3E, so I shouldn't have any trouble... BUT... I tried those firmwares using English as system language, always getting the error message "An error has occurred [...]" at the boot, I can't even reach the "Loading" screen... Please help me... EDIT: I tried the Ak2i on my Fat NDS and it works perfectly. Still don't get how to make it work on DSi. EDIT 2: SOLVED!!! Although my DSi firmware was 1.3E the ak2i needed the danny phantom update! Yay!