I’m confused about how Arduino firmware works. If I wanted to repurpose my ItsyBitsy so I can upload sketches with the Arduino IDE, do I need to upload new firmware? If I do, I believe I need to download the original firmware and upload it with avrdude. I think “Caterina_itsybitsy5V.hex” is the correct firmware, found at this url.
After pressing the ItsyBitsy button twice quickly, I think the command I would use to upload this is something like.
/Applications/MDS.app/Contents/MacOS/avrdude -p m32u4 -p avr109 -P /dev/tty.usbmodem14101 -C /Applications/MDS.app/Contents/Resources/avrdude/avrdude.conf -U flash:w:Caterina_itsybitsy5V.hex
Is this right?