Flash MicroPython Firmware to ESP32 and ESP8266 with esptool.py
Flashing MicroPython Firmware with esptool.py on ESP32 and ESP8266 | Random Nerd Tutorials
Fatal esptool.py error occurred: Failed to connect to ESP8266: Timed out waiting for packet header_ - Avrdude, stk500, Bootloader issues - Arduino Forum
How to Save and Restore ESP8266 and ESP32 Firmware - CyberBlogSpot
SOLVED] Failed to connect to ESP32: Timed out waiting for packet header | Random Nerd Tutorials
Esptool.py: Command not found (ESPTOOL-390) · Issue #427 · espressif/esptool · GitHub