DSTT

Can i put other software (Like R4 or something) On my DSTT? If yes, then which software can i install on it and which should i choose?

you can't unfortunately I tried and it crashed...:/

DSTT can use the unofficial 1.17a12 firmware (which is the best for it) and Ysmenu.Here is 1.17a12
http://www.linfoxdomain.com/nintendo/ds/dl.php/DSTT_v1.17a12unofficial_English.rarInfolib and Extinfo updates
http://loda.jp/dsm/ (Japanese, but just download the ones with the infolib/extinfo names)

TirithRR that wasn't my question, i asked if there is any firmware that ISN'T from DSTT that i could put on that card.And thanks Boy281 for answering my question :D

I was telling you what firmwares work on the DSTT. DSTT Firmware, and the Unofficial Builds, and Ysmenu.Try not to be ungrateful.

If you mean homebrew kernels et cetera then there are a fair few a more recent one is dscoverd it's on. Filetrip in the dstt section iv forgotton what the others are called I'm sorry I can't be any more help I'll check my download history and try find out for you