My brother got me an acekard for my birthday but, my acekard doesn't work on his dsxl but his does any ideas? He is running firmware 1.4U. Both our acekards are running the AKAIO 1.6RC2 acekard firmware.
You need to update the acekard, and you'll need access to a DS or DSi that is on firmware 1.3 or lower to perform the update. http://www.emuboards.com/invision/index.php?showtopic=31399