At the heart of the ESP-01 module is the ESP8266 chip with at least two boot modes — the normal mode and the programming/flash mode. The latter refers to uploading any software (or firmware) to the ...

The ESP-01 launched the ESP8266 revolution back in 2014, and while today you’re far more likely to see somebody use a later version of the chip in a Wemos or NodeMCU development board, there are ...

Programming Options: esptool Arduino will overwrite NodeMCU but that’s easy to reflash. I followed [cnlohr’s] direct programming guide to write the binary using esptool.