ESP8266 Community Forum

Attached photo is a ESP-12E on NodeMCU board. Some findings:
1. The flash chip is "BergMicro" 25Q32ASSIG. I'm not able to find any datasheet about the chip. The chip ID reads as "EF", which is the same as WinBond.
2. The chip runs on DIO mode. Pin 3 and 7 are connected to VCC. This makes GPIO9/10 usable. And user shall only program the chip in DIO mode.


Below is a photo of ESP-12E manufactured in May 2015 for comparison.

The upper one, with the cloud icon, is actually an ESP-12Q. These module are usually sold mislabled as 12E, but the silkscreen on the back does say ESP-12-Q and has GPIO4/5 labeled correctly.