Upload & Sell: Off
I've also messed up my e-M5 menu settings several times, generally when in a rush and desperately threshing around after some setting only vaguely recalled. Fortunately, I have two, and can set 'em side-by-side and compare until I find what I have done. If I ever hose both at the same time, I'm sqrewed
I find their implementation of MySets sort of annoying on the E-M5 (to many clicks to get there, and remembers way more settings than I typically want it to). However, since they do save essentially all configuration they are a good way to set a "recovery point". That way if you suspect you've accidentally left some mystery setting where you don't want it you can resort to something less drastic than "reset all" and be back in business.