Reset sonoff dw2

Hi! Can somebody help me reset sonoff dw2 wifi sensor?
I connected 2 new sensors to wifi, but it always offline in app and not reacting when closed or opened. Now i want reset both sensors, when i push pair button it don’t start blink. Nothing happens…
I tried new batteries, still non working
It can blink few times if i replace battery and start push pair button

According to the documentation, you need to hold the button for a long time (5 or more seconds) until it starts flashing