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sonoff s20 eu

After changing the router  my two s20 are unable to connect to the router,

the router is 2.4 very closed to the s20 only three devices via wifi.

1 pressing the power bottom five seconds the green light blink three times not two and in normal set up the app never find the device.

2 in adaptive set up the app find the device, can change the name but after that a green light blink about every three or four seconds and the app show : device offline. 

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