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

David Crocker

==== 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 firmware. '''Only erase the firmware if your board is completely unresponsive, or if instructed to do so by Duet3D.''' 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 appear 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 neither port is shown, then the Duet may be faulty or it may not have valid firmware installed. With USB power applied, erase the firmware. '''Only erase the firmware if your board is completely unresponsive, or if instructed to do so by Duet3D.''' 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 appear 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 your supplier (if you purchased your Duet direct from Duet3D then follow [https://www.duet3d.com/warranty|the warranty return process])

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