Problem with R4isdhc.hk 2014 not recognised by my DS

HI.

My card : R4 2014 3ds upgrade SDHC Revolution for 2DS 3DS DSi XL/LL DSL RTS lite Real Time Save www.r4isdhc.hk



My R4i card was working fine and after trying a homebrew my DS no longer recognizes the card.
When I launched the "YSMenu" homebrew, I had a white screen and nothing ...

I had made a backup of my card (kernel / software) before on my PC.
The sd card is microSD 2GB.


What I...

Problem with R4isdhc.hk 2014 not recognised by my DS