How to connect Wi-Fi shield ESP-12E-ESP8266-UART-WIFI-Wireless-Shield with Arduino
There are some fake Modules on eBay! Only after changing the wiring can you use them. The fake modules have the wrong text printed on it.


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But when you change the wiring you can use the shield!

The two transistors which are connected to Arduino board pin 0 and 1 have to disconnected. Also the connection to the switches 1 and 2 have to change. Then you can stack ESP-12 shield on the Arduino. You can now flash the Arduino Uno when you switch off (switch 1 and 2) With the old wiring you can't use it because the transistors are wrong connected. 

The voltage divider is need for 3,3 V ESP-12 RX pin