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By joebowen42
Mac 10.13.6
IDE lists Artemis
Updated CH340 driver
Tried mutiple USB ports and cables
UNO board works
1.8.19 version of IDE
User avatar
By TS-Russell
Try switching the bootloader and/or baud rate per this guide ... th-arduino ; also try uninstalling the ch340 drivers (mac shouldn't require them?), and ensuring that the board definitions are up to date

If none of that works, perhaps test the device on PC or Linux instead, if available? Finally, if nothing works it might be a defective board and we can swap it out via
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