I am using Windows 10 and I was playing around with particle device doctor for some other issue. However, now I am not able to change the settings using the particle doctor as it is throwing up serial error. I am able to flash tinker but I am not able to connect to the internet. I guess I have made …

Serial err: Error: Opening COM1: File not found

ScruffR May 11, 2019, 7:52pm 3

How do you try to flash in DFU Mode?
What does particle binary inspect <firmware.bin> for the binary you intend to flash say?

Can you provide a video of that (min. 30sec)?

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