ESP-01 ESP8266 - failed to enter flashmode

Projects General Guidance
11

With esp01s (I think this is what you have), CH_EN pin is pulled up by the board.

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https://www.e-tinkers.com/2020/04/a-better-way-to-use-esp-01-as-wifi-shield/
https://forum.arduino.cc/t/esp-01s-beginner/903667