A small addition to the solution of clearing the browser cache with ctrl+F5; there was an update pending for Firefox due to which the cache couldn't be cleared. After updating Firefox the switch was visible!

Hello dear experts, Sorry to bother you in this old post but I couldn't find solutions in other topics (I am a just starting newby). I have the very same problem as markk (03 feb 2016); configuring the oscillator I take it means remove the solder connection of 4.7M and solder a bridge to 3.3M, I ...