dfu-util: Cannot claim interface 0

  • I'm trying to update my firmware on my Pycom Expansion board V3.0.
    I'm running Fedora 28.
    When following instructions acording to https://docs.pycom.io/pytrackpysense/installation/firmware
    To enter update mode follow these steps:
    Unplug the device
    Press the button and keep it held (on the Expansion Board the S1 button)
    Plug in the USB cable to the host computer and wait 1 second before releasing the button
    After this you will have approximately 7 seconds to run the DFU-util tool
    macOS and Linux:
    $ dfu-util -D pytrack_0.0.8.dfu
    You might need to run dfu-util as sudo. In that case, you will need to enter your password.

    own output:

    sudo dfu-util -D expansion3_0.0.9.dfu
    dfu-util 0.9

    Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
    Copyright 2010-2016 Tormod Volden and Stefan Schmidt
    This program is Free Software and has ABSOLUTELY NO WARRANTY
    Please report bugs to http://sourceforge.net/p/dfu-util/tickets/

    Match vendor ID from file: 04d8
    Match product ID from file: ef99
    Opening DFU capable USB device...
    ID 04d8:ef99
    Run-time device DFU version 0100
    Claiming USB DFU Runtime Interface...
    dfu-util: Cannot claim interface 0

    Google didn't help me so far.

  • Solved. My mistake. I just connected to the expansion board, without the WiPy module on top of it. Then it had the error.
    With the WiPy module connected to the Expansion board, and following the instructions, the firmware update went fine.

Pycom on Twitter