I too am having the EXACT same problem. Just got my card today. Verfied it was an official card by pulling it apart and comparing it.
Just got my AceKard 2i today from Dealxtreme.
Placed it in my DSi (Firmware 1.4u) and got the error screen. Figures I wouldn't get the already updated one though..
So, as per your instructions, I set my card up EXACTLY as explained in the tutorial posted on this site.
I booted up the card on my other Nintendo DS (Lite) and it the card loaded fine.
I click on the dsl.nds firmware upgrade and followed the instructions. Exjected the card, pressed "B" than pressed "start" on the next screen.
Progress shows 0% and sits.
I've searched through (literally) hundreds of posts on this site and others and tried nearly 10 different methods they suggest. Even went on youtube and watched some six year old
do exactly what I did, but his Progress went from 0% to 5% within a few seconds and completely installed like 40 seconds later. I'm still sitting at 0%
Any suggestions as to what I could be doing wrong? I've followed everything perfect I think.
Or possibly does someone know where to get the already compatible 1.4 Acekard 2i? I know there out there now. I'm thinking I am going to have to get a new one.
Thanks!