Here's where you have to really be careful.
Both of which will uncompress the archive for you and put it in a folder on your PC or Mac. Once you have the firmware file, you may need to download the shareware version of WinRar or 7-zip. You can often take a look at the sticker on the card, and compare it to the R4 3DS firmware files we have on our firmware page. Check the package you received and make sure to download the firmware for your card. The R4 3DS Card, sometimes called the R4i 3DS SDHC Card is one of the very first cards that worked on the Nintendo 3DS.
