The R4 SDHC also has the “SDHC” logo next to the R4, while the R4v3 has “Upgrade” underneath the main “R4″ letters. Credits and their country are listed beside each link so users can decide which servers might be fastest.
The software for these three cards can be obtained below.
Once this update was implemented though, it blocked Nintendo DS flash cards.
During this time, many stores have been advising people not to update their DS cards until fixes were announced.
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.