I am using the R4i SDHC RTS. NesDS works perfectly. Any Sega or GBC emus? Also, saves for DS games, mainly only Castlevania games go corrupt. Have tried Wood, YSmenu, TTmenu. Changing from Fat to Fat32. Upgrading to the latest firmware. Formating the MicroSD card. I decided to take my brand new MicroSD from my new Android phone and see if that helps. I've seen this help a few others the past 4 years. Don't know if it will, too disappoint to check. Worked up to 50% completion Dawn of Sorrow in just a few hours. Kind of upset. Sooo any other Emulators besides NES.