Ok, i was too quick..
I didn't see the option to add the exfat in the drivers until I started to update.
After I rebooted, I got the nag for the update.
I tried to reboot back to hekate, but it fails to load.
I tried to put all the files (sdfiles, choixdujour,..) on a 4gb, but it doesn't load either.
Is your sdcard set to fat32?