Firmware "downdate"

Is there any way of reverting to the older operating system that I just overwrote on my Fuze - the latest version barely works on my machine at all

Just go here firmware version 01.01.22 You’ll have to manually download it and manually update your fuze.

http://forums.sandisk.com/sansa/board/message?board.id=sansafuse&message.id=9473#M9473