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I am getting this error message.
Serial port COM3 not found.
Answers ( 2 )
Open the Device Manager by searching for it in the start menu. You can also try right-clicking the Start button and choosing Device Manager.
In the Device Manager, open the Other Devices section.
Review the list of devices. update driver.
https://sparks.gogo.co.nz/ch340.html
or can also install the driver if uno is of ch340 driver compatible.