I salvaged an OLD S350 that happens to have one of the first firmware versions released (2.03).
Would anyone happen to have a newer firmware installation file (say in the 2.80 to 2.82 range) or be willing to share a CF image from a unit with a more recent firmware version?
Since the S3xxs have been EOL for ages, firmwares are all behind a paywall / service contract now.
EDIT: Found CF card images, thanks to another user here for posting them a few years ago!