R4i SAV Troubles

Well, I got 2 R4i's for me and my younger brother for our new DSi's, but I'm having some troubles with the SAV's. Whenever I go to run any homebrew, it acts like there is no SAV and just creates a new one. I'm really at a loss with what to do, and I have tried to do things that people said online. I have already reformatted the SD card with Pansonic's SD card Formatter. One thing that struck me as odd though, is that I did not have to patch the firmware, even though my DSi is at the latest version. So far, it hasn't worked in either of our DSi's, mine being the newest and my brothers 1.0, and both of us have identical R4i's and 2GB Memory Cards. Any help is appreciated.