• Ok, I reflashed with the new cable and it seems to work now...
    Sorry for the disturbance!

    So I closed the discussion and can't add more posts....
    Things are tricking:
    Turning off minimification and offline mode imposed me to disconnect and reconnect the board in order to have success. Otherwise, the errors went back as described above.

    Then, setting back offline mode does impose the same disconnection/reconnection once only and the problem seems not to reappear: Non errors nor warnings and correct result of 21.

    Then turning minimification back to Espruima offline on, did imposed also disconecting/reconnecting once only the board.

    Then turning minimification back to Closure online (whitespace only) on, did imposed also disconecting/reconnecting once only the board.

    So it could be a problem of stored configuration in the web ide finaly???

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