How To Program Raw ESP8266-12E/F Chip using a NodeMCU

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we are going to disable the ESP8266 on the NodeMCU by forcing the EN pin low, this will prevent the ESP8266 module on the NodeMCU from booting. We are then going to going to connect all the relevant pins of the NodeMCU board to our external ESP8266.

Wiring it up:
Connect 3V of the NodeMCU to VCC of the ESP8266
Connect GND to GND
Connect TX of the NodeMCU to TX of the ESP8266 (This is different than the previous step)
Connect RX of the NodeMCU to RX of the ESP8266
Connect D3 of the NodeMCU to GPIO 0 of the ESP8266 (D3 is GPIO 0 of the ESP8266)
Connect RST of the NodeMCU to RST of the ESP8266
Connect EN of the NodeMCU to GND

Uploading a sketch:
Once you have the ESP8266 wired up, you need to do the following:

Select the port number of the NodeMCU (Tools- Port)
Select the Board type "NodeMCU 1.0 (ESP12-E Module)"
Click upload

And that's it! It will automatically enable programming mode and will automatically reset when finished uploading so it will start executing the sketch.

Preferences link:

Download: ESP8266 Flash Tool

ESP8266MOD user manual PDF:

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