I have read on another forum that you want to use the serial port. DO NOT! Use the card method as it’s less risky. You can find lower capacity (less than 2GB) San Disk cards on Ebay very easily.

Format the card on Eclipse. If it stores presets correctly it will also work for system updates

If you are upgrading from a version earlier than 3.51 then you must install 3.51 first
If you are upgrading from version 2.0 or earlier and experience keyboard freezes while upgrading, you may need to upgrade the bootloader..