A short month ago,
sharksym updated his MMC/SD BIOS, which brings it up to version 4.01. For more information regarding this release, refer to the thorough user's manual on his website.
Upgraders should be aware that the partition table from BIOS 3.xx is incompatible with the newest version, and will have to be reinstalled.
Relevant link:
MMC/SD BIOS 4.01