Fatal esptool.py error occurred: Failed to connect to ESP8266: Timed out waiting for packet header_ - Avrdude, stk500, Bootloader issues - Arduino Forum
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Arduino-er: Flash ESP8266 Firmware using esptool.py
Esptool.py: Command not found (ESPTOOL-390) · Issue #427 · espressif/esptool · GitHub
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esptool.py: command not found · Issue #343 · espressif/esptool · GitHub
Esptool - No such file or directory - Arduino IDE 2.0 - Arduino Forum