2 - Fix for accessing data via USB with more than 2 devices configured.
8 - More SCSI bug fixes (some timing issues resolved in the FPGA image)
9 - Firmware update support using scsi2sd-util6.
15 - Improved SD card compatibility
16 - Fixed SCSI interfaces on slower SCSI controllers
17 - Significant performance improvements
18 - Added SD card hotswap support.
21 - First BETA firmware for the 6.0 hardware version of the SCSI2SD.