dsi r4 not working an says it\’s expired – Help!?

When I click on the game icon for my R4, it starts loading and this message comes up :

Wrong data or firmware expired! Please check NDS machine data configuration.
If firmware expired please download latest firmware from www.r4i-sdhc.com

– I’ve never had to download firmware or anything before so could someone help me with what to do?

thanks (=