As far as I can see is there no bug in the system, which accours a complete system crash.
If it would be neccessary to do an update, you can choose, on which days you won't use the keyboard and bring it to your dealer.
no one would give the keyboard away for 1 or 2 days just for fixing a bitmap in the display because it shows a 6-string instead of a 12-string guitar. let's talk about REAL problems. do you agree?