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Hi
I got my KC868-A4 Rev 1.2.4 from Aliexpress. If I power it up all 4 Relais and Controll LED are on. Pressing S2 Button starts all Relais and Buzzer to "Maschingun". Button S1 Turns of Relais but if Button released Relais are back on.

Thanks for your help
Ganesh
you need download firmware firstly