"And you could just have easily returned the keyboard with an OS update, as without." Only if my return window had not closed, and the clock was running. As for wanting OS updates, sure - with a warranty that they will work and that they will do no harm. That the download and install is at my risk, expressly without any warranties, is unacceptable. And of course there's no problem - until there is one, and your $5,600 instrument cannot be played and cannot be sold, and if you want to contest Yamaha's position, you must do so in Japan and under Japanese law (with which you may be familiar, but I am not; and while I had a bit of Hiragana and Katakana, that was many years ago, and it was never at a level that would suffice in a court proceeding; and the costs of retaining Japanese counsel would likely exceed any recovery). I do not believe I made a mistake.