What happens if you try to upload without plugging in the programmer? I’m thinking it’s finding the programmer, but not the chip. My first mistake was thinking that the diagram of the connector on the programmer schematics was looking at the face of the connector. I finally made some progress when I realized it’s actually a diagram of the male connector. (So it’s mirrored). The other thing that gave me that message was the “power board” switch. Also got it trying to use the upload button instead of the “Upload using programmer” menu option, or shift+upload.
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