I was able to successfully update my Tyros to OS version 1.10, but not without an initial scary glitch. In the middle of updating, my PC (Windows XP) unexplicably 'timed out'. Thankfully I was able to reboot the computer, and then re-initiate the OS Update proceedure from where it left off. Thankfully I had remembered NOT to turn off the Tyros during all this, because this would have probably resulted in losing everything and then not being able to reinstall the OS. Believe me, I was really sweating it there for a few tense minutes.
Btw: the USB connection works well, except for its disappointingly slow transfer speed: 8 kb/sec.
In addition to transfering files to/from the Tyros via my PC's keyobard, what I love is the ability to ORGANIZE and rename files on the Tyros, from my computer instead of on the Tyros keyboard itself- this is so much more convenient and much faster. The other cool utility is the ability to edit Tyros sounds from your PC instead of on the Tyors itself. Haven't had much chance to play a lot with this yet, but it really makes sound creation EASY to do when you can do it from a large PC screen monitor. - Scott