My girlfriend got me a DSi for Christmas, and I immediately ordered an R4. I ordered the R4i3D ( http://www.dhgate.com/r4i3d-v1-41-v1-4-1ca...ef21da5db0.html ) and purchased a 4GB MicroSD card to use with it. I formatted the MicroSD card and put in the Game Played Kernel via http://www.r4i3d.com/index.htm?c=gamekernel (R4i English V1.4.1L). I played games for hours on end for four days and on the fifth day, my DSi was unable to read the card. It wouldn't show up at all. My DSi said that there was no game cartridge and occasionally it would appear again if i restarted repeatedly, but an error message kept showing up and saying to restart the DSi and check the manual for troubleshooting issues. The R4i3D is supposed to support the latest firmware update, and as far as I knew my DSi was running on V1.4.1U the entire time I was playing. I don't know what the issue is and truth be told I am new to the scene of R4's so please excuse me if this is just me sounding stupid. Please try to help me out. I would appreciate it very much. Thank you.