If it's less 5.5022, than you've to upgrade your bootloader for using SDHC cards up to 32gb
You've to put the new Bootloader, for instance 5.5128 on the old max. 2gb SD card. Be sure your battery is full loaded and better connect to the power supply as well.
Reset your device, watch the screen you will see an annoucement and the upgrade will be done into a few seconds
Now you're able to use SDHC cards, up to 23gb, buy the class 10 for the best results.
Read my signature for FTP support, you'll find there all your needs.