• Thus, my current tips are:

    • if nrfTools give you the message
      xxx bytes were sent while 0 bytes were reported as received
      just retry - even if you have to retry approx. 100 times! (it still only takes a few minutes
    • after completion, connect the Espruino Web IDE with your Bangle.js and check, that the terminal displays the correct (i.e. new) firmware version!