I’ve decided to change my upstairs switch. I did “copy-paste” from old switch. It working ‘if’ I’m not touching downstairs switch. If I do so, my upstairs smart have no power. I’ve tried many different combinations, but can’t find right one :/// . Maybe somebody knows the HOW?
Upstairs wires: 2 Browns, Silver, black & blue with brown sleeves, my smart switch have L, L1& L2 holes
Downstairs: brown, black & sliver with brown sleeves, standard one gang 2-way switch
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