I have seen a lot of posts about problems getting the duet to talk to laptops and thought I would share something I found that solved the problem for me. Although the laptop could see the duet, It couldn't read the SD card and the USB connection was very hit and miss. I assumed I had dodgy board. However I managed to source through a colleague a second duet board (a much older one that came with one of the first RS printers) - it worked fine, so I triumphantly updated the firmware to the latest version as per commissioning instructions, only to find that it promptly now did exactly the same thing as my original board :( The only thing they had in common was the SD card, which was working fine before I updated the firmware. I dug out another, better SD card that I had laying around, formatted it, added the relevant files and voila - all sprang to life on both boards! My conclusion...that the supplied SD card worked on the very original firmware, but failed to be good enough for the later version I installed, so maybe worth a try if you are experiencing something similar
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