Upload error - was working fine before

  • WEMOS D1 Mini V2.3.0

    The last uploaded program still runs successfully, but I can't upload any new program..

    This is the output PlatformIO upload is giving me:

    Configuring upload protocol...
    Looking for upload port...
    Auto-detected: COM3
    Uploading .pioenvs\d1_mini\firmware.bin
    warning: espcomm_sync failed
    error: espcomm_open failed
    error: espcomm_upload_mem failed
    *** [upload] Error -1

    Also tried to manually pull GPIO0 low GPIO2 high but nothing helps.
    Also disconnected all sensors etc. just plain WEMOS dev board connected via USB to PC.

    What could be the problem?

    (I see the LED Flash a couple of times, but it can't enter program mode and launches the last program afterwards)


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