A new flashcart or a new firmware? For updated firmware for the R4, check here: http://forum.romulation.net/index.php?topic=38948.0 For a new flashcart, look at the Acekard2/2i, Edge/iEdge, CycloDS, EZFlash V/Vi, Supercard DSone/onei and even the M3i Zero.
what r4 r u using and if ur using the original r4 then heres the link http://filetrip.net/f10373-Wood-R4-1-05.html