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Sonoff 4ch pro switching problem

I have a problem with 4ch pro. I can't switch on the 4 channels at the same time. When I switch on any channel and try to switch another channel the first one switch off. This happens to any channel. I try the solutions such as to reset from the board with S5 button, to reinstall pressing any button for 5 sec. Is there any other solution?
1 Comment

For me it sounds you switched on interlock.... Look in settings of this device and switch it off

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