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Nevrmind, got it. Just put the JSON link into the preferences in the Arduino app. I can see it now

Ok strange, I get a sketch to compile, but it claims my bootloader is 2.1.6 and the code needs 2.1.7.

I try to flash the bootloader, but it claims that I have 2.1.6 and that is the latest.

So I poke around and in ~/Library/Arduino15/packages/Z-Uno/hardware/zw8051/2.1.7/bootloader, we have a ton of .bin's @ 128k each.

And I don't see a 2.1.6 dir anywhere.

Any hints?

Looks like uninstall/change additional boards URI/restart/curse/reinstall 2.1.7 seems to be allowing me to flash that bootloader onto the device. Go figure