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Sonoff B1 lamp dead on arrival ?

I ordered a B1 bulb via Ali express to evaluate it for using it with Tasmota. Received the bulb, but it seems completely dead. Seller offered me a refund if I return it, hoever shipping cost will be more than the refunc, so this is not an option. 


Is there anything which I might overlook ? Connected it to mains via a switch expected it to light up after toggling theswitch 3 times, but nothing. Also not visible as WIFI access point. 


Are schematics of the B1 available ?


Are there any people with bad quality experiences related to the Sonoff products ? 

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