I was guessing that the S50 update is the update experiment, guinea pig, test group, beta test, time trials, dry hump, hope it works group.
I'd rather have them do it right, then cause problems with a bad update.
Stay the course.
Why not just plug it into your computer with the MSS software running and let it do its thing?
Perhaps some ambitious person could capture the updated IMAGES/CLOGO and WPAPER directories in a zip file and post them here...
Been there, done that, left everything running for over an hour. The MSS thing apparently doesn't work unless you reset the S50, losing all of your songs. That's a hell of a waste, especially when the channel you built about 1000 songs from no longer exists.