Title says it all, I can't map "Change Sport" to any of the Hot Key buttons on my Aviator (FW 3.40). Of course I can select it, it just doesn't work when I press on the actual button. Others options seem to work just fine - e.g. I can assign "Wallet" or "Phone" to the "Hold Start" and it works when I press on that button, same if I use "Hold Back".
"Change Sport", a seldom use function on a fitness watch fore sure, cannot be effectively mapped to any button - nice !
At the price your are selling these watches, you could at least hire one person to do actual QA.