I've used a 2GB forever and finally deceided to open the 4GB i had setting around. wouldn't work for some reason, kept getting the "Loading" screen like you all said. Spent an hr looking around for fix, even tried copying my 2GB files over to it just incase of corruption, no go. So found the R4 v1.23 kernel on another R4 Site, tried it. No go. Came here and read a little and put 1 & 1 together and deceided to look into this SDHC stuff. Before I even went any further, I took the card out of my R4 and said 'Oh poop!' ....u guessed it, I had a Micro SDHC and as we all have read, the HC versions don't work on these. If they do, someone should post what the did to get them to work. By the way, v1.23 is used for SDHC cards and it doesn't work on this version of R4. Hope that helps. "Look at your micro SD card and if it says Micro SDHC, then better go get a different one >.<"