• I made the same procedure and i feel the detent 'click'. In #16 I wrote, there is a changing on Pin C13 from 0V to 3,3V, wenn I pressed the button. In this sense, the button must be ok.

    DigitalRead(BTN1) <--no pressing the button
    =0
    digitalRead(BTN1) <--Here I pressed the button
    =0

    Both worked for me. Worth a try. . . .

    What are the differences between the two switches? Do you can explain that for me?

    As @Gordon explained in #15 above, are you able to manually jumper the button and get the above digitalRead() to work? If so, are you able to flash that way?

    When I manually jumper the button it's the same. No changes of the level.

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