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I've tried to run code and update the ZUno 2 on two separate computers (Mac and PC) but I keep getting this error:

It seems you try to use toolchain for ZUNO G1, but you have connected ZUNO G2 version 0305 to your PC via COM6.
Please use the right toolchain for your board. If you have both boards connected - select the G1 port.
Follow the instructions from https://z-uno.z-wave.me.
Good luck!

I don't see any other options when it comes to selecting a board or port within the Arduino IDE and I've updated Z-Uno to 2.1.8 in the board manager. Where is the option to set/change from G1 to G2?

I'm able to program a Z-Uno Gen 1 but not Gen 2.

On top right of the https://z-uno.z-wave.me/getting-started/ page please select Z-Uno 2

Thank you

Please remove the link to the Z-Uno Quick Start Guide on the Z-Uno 2 version of the Getting Started page, or update the linked contents. The linked PDF contains instructions for Z-Uno 1 which don't work for Z-Uno 2, ultimately leading to the error which brought me to this page. Only if you skip over Step 1 on this page and start with Step 2 will you find success!

You are right, thank you for your feedback.