Fix Dahua VTO Unlock

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I have a Dahua VTO door station paired with three VTH indoor LCD monitors. Everything talks to each other—video, audio, call-throughs—yet when I press “Unlock” from any VTH panel or through the DMSS mobile app the voice prompt says “Successfully unlocked”, but the door’s electric strike never fires. No click, no movement. Here is the current setup so you can jump straight to the root of the issue: • The strike is powered by its own 12 V supply and its two wires run straight to the VTO relay…

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