If your that desperate for 4 gig get yourself a Slot 2 card and use Dualslot browser to copy stuff of slot 2 to slot 1 there you go 4 gig of storage and the ability to play gba games
Listening to people whine about the R4 and SDHC, you'd think that it would cost more than $25 USD for a cart that does support SDHC.