R4i card help please

Evening all,Currently have aan r4i sdhc card with a 4gb micro sd card which works a treat but here's the problem - today I bought a new r4i sdhc card for a friend and plugged my existing 4gb sd card in to it, plugged in to my ds and the following message appears: "system date error! please check NDS system date" i'm guessing the obvious here maybe but does this mean my new cartridge is a duff one? Thanks in advance, Dave.

make sure the cards are exactly the same as their are lots of variants of the r4 card, the original ones are no longer made,check the actual cartridge for the web site address for downloading the firmware as it will not work if the firmware is non specific for the new cart

Hi just wanna say i just had this problem. All you need to do is go onto the ds and change the date to a previous date and this will sort the problem out