R4 card is not recognized on the ds?

So i have a nintendo ds and haven't played for a long time i still had an r4 card and now it is not recognized please help me!

http://www.seitseid.de

Have the contacts cleaned?

Yes

It's old

I also have exactly the same R4. Doesn't work with me either.

Since I have a 3DS, I just decided on CFW.