I just purchased a DSI from ebay that is running 1.4.3u and I' m new to the scene. I bought the R4I 3DS Card and followed the instructions and loaded the latest firmware 1.53b from R4I-SDHC.com. I'm not able to run the flash card, I get an error System File Is Missing. The version 1.4.3 shows that it's compatible on the website but I'm not sure if it is because it end in 'U'. Any help would be appreciated. thanks.