I have this. i got it last week. http://www.amazon.com/-DATA-Class-microSDH...4208&sr=8-1 after a failed attempt to boot sakura, I did the following steps 1. borrowed someone's M3i Zero with his microSDHC (transcend 4gb class 6) 2. updated the M3i Zero to core 1.6.1 and did a backed up the important data on the transcend microSDHC. 3. formatted both our microSDHC's using Panasonic tool 18.104.22.168 (quick format, size adj. off) -Transcend max filesize was 3.78gb, my microSDHC (a-data) was 3.75gb. both were fat32 afterward. 4. i got http://filetrip.net/file.php?id=13031 and put the system folder in both microSDHC's. i copied only this folder. did not copy anything else. -both microSDHC were recognized on my PC. i didnt notice a transfer speed difference when copying over the system folder. no problems on this end 5. booted up DSi (on firmware 1.4u) and attempted to boot into sakura for the first time. both microSDHC had the screen where you pick either sakura or touchpod. on both microSDHC's , I picked sakura. 6. repeated the same as step 5, except this time, I chose touchpod results transcend: booted into sakura "now loading" screen. on the top screen, the sakura animation started. booted into sakura...success. also booted into touchpod...success a-data: booted into sakura "now loading" screen. on the top screen, it was black. i waited 5 min and it stayed like this. did not boot into sakura....fail. on touchpod. both screens were black with the bottom screen stuck at "now loading". waited 5 min and it stayed like this. did not boot into touchpod...fail. my question is: is the a-data microSDHC incompatible? is there such as thing as a microSDHC that is not compatible with flashcarts? how would i know and check when shopping for a microSDHC? is this problem an isolated situation, as in does it only apply to the M3i Zero? will it have this problem on another flashcart?