ah got you, thank you :)

Yes correct, only the upstairs light is in a a 2 way configuration. the downstairs hall light and porch light are only 1 way.

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A couple questions for the 2 way switch with the zbmini:

• can the existing 2 way wiring not be reused or will I need an electrician for this?
• can this be done with the zbmini in the upstairs wall switch, with one gang of the downstairs switch being wired to this for the two way configuration.