Available for download here are the two (three including the R4v3, who is an outside contender) stable versions of the R4 Revolution DS Card.
To know which version you have (provided you have an official / real version), a quick look at the card itself should tell you: Based on the above three designs, you should be able to distinguish which card you have.
During this time, many stores have been advising people not to update their DS cards until fixes were announced.
Now, however, first on the scene with a fix comes from the R4i team – that is the first R4i team, not the clone R4i guys (good luck listing them all, there are many fakes and clones!
The software for these three cards can be obtained below.
After downloading and decompressing the new updated files, there will be one shell folder and two files _DS_MENU. This is the first official ‘firmware update’ in over a year where users don’t have to buy a brand new card to continue using them on their DSi consoles.This is significant and probably gives the R4i 3DS team a bit more respect; this means that the components they’re using to build the R4i 3DS / R4i SDHC cards are now better.This update was activated through the System Update menu in the Settings menu of the DSi, or when you access DSi Ware online.Once this update was implemented though, it blocked Nintendo DS flash cards.