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Revision to What to do if your Duet won't respond

David Crocker

* If a port called '''Bossa port''' is shown then the firmware has been erased. Perhaps you pressed the Erase button. You need to re-install firmware via USB. How to do this for the Duet 2 Wifi is described in section "Fall-back procedure #3" in [[Installing and Updating Firmware]].
* If an '''Unknown Device''' is shown (but only when the Duet is connected) and you are running Windows, install the Windows device driver for the Duet.
* If neither port appears, or you get a Windows error message several seconds after you connect the Duet via USB, try connecting it to a different USB port, and try using a different USB cable. Windows 10 sometimes gets individual USB ports stuck and poppingpops up an error"Error reading device descriptor" message when you connect devices to them. If this happens, use another port, or reboot Windows.
* If neither port appears, or you get a Windows error message several seconds after you connect the Duet via USB, try connecting it to a different USB port, and try using a different USB cable. Windows 10 sometimes gets individual USB ports stuck and poppingpops up an error"Error reading device descriptor" message when you connect devices to them. If this happens, use another port, or reboot Windows.
 
==== If the port still doesn't appear on the PC ====
 
* If neither port is shown, then the Duet may be faulty or it may not have valid firmware installed. With USB power applied, erase the firmwarefirmware. On older boards do this by holding down the Erase button for at least 1 second, then press the Reset button. On newer boards there is no Erase button; so fit a jumper across the Erase pins, then connect to USB for a few seconds, then disconnect from USB, remove the jumper and connect to USB again . The Bossa Port should appearappear in Device Manager; if it does then you can upload firmware using SAM-BA or Bossa/bossac 1.8 as described in section "Fall-back procedure #3" in [[Installing and Updating Firmware]].
* If all the above steps fail and your Duet is still under warranty, contact youyour supplier (if you purchased your Duet direct from Duet3D then follow [https://www.duet3d.com/warranty|the warranty return process])
* If neither port is shown, then the Duet may be faulty or it may not have valid firmware installed. With USB power applied, erase the firmwarefirmware. On older boards do this by holding down the Erase button for at least 1 second, then press the Reset button. On newer boards there is no Erase button; so fit a jumper across the Erase pins, then connect to USB for a few seconds, then disconnect from USB, remove the jumper and connect to USB again . The Bossa Port should appearappear in Device Manager; if it does then you can upload firmware using SAM-BA or Bossa/bossac 1.8 as described in section "Fall-back procedure #3" in [[Installing and Updating Firmware]].
* If all the above steps fail and your Duet is still under warranty, contact youyour supplier (if you purchased your Duet direct from Duet3D then follow [https://www.duet3d.com/warranty|the warranty return process])

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