Question about my SD Card

I've got a DSTT at the moment, but can i put R4 software on my card? If yes, how can i do that?
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With a DSTT, you do not want to put R4 software on it. That is a step backwards in compatibility. In order to increase compatibility on the R4, they put a modified DSTT firmware on it.You should update to 1.17a12 and the latest Infolib and Extinfo files.1.17a12
http://www.linfoxdomain.com/nintendo/ds/dl.php/DSTT_v1.17a12unofficial_English.rarInfolib/Extinfo updates:
http://gamewiki.jp/uploader/dsma/
http://sites.google.com/site/weeklyinfolib/