You don't need YSmenu, it's just an alternative option to the official firmware. It has the advantage of not containing a time bomb(pre-determined date the official software is coded to stop working), however it doesn't work properly with any roms that were DSI-enhanced, even on non DSI hardware. The official software doesn't have that problem with the DSi-enhanced roms. Also they usually update the software to extend the time bomb date so since yours is a fairly new one it should be good for at least a few years yet with the official software. The software for the card is at the website printed on the label.