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4CH PRO 2 Wifi led flashing times

Someone knows what does it means when the wifi led flashes once every 15/20 seconds?

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If it happens to someone else: the device is broken (the answer is from technical support)

It is the firmware that stop working. I flashed another firmware  and the harware works as aspected.

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Hi, how to I can reinstall the firmware on my 4CH Sonoff Rev 2. Thanks for the help.
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