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By Koichi Sugimoto
#87508 I programmed with Arduino IDE to use GPIO1 and GPIO3 for digitalWrite.
After writing the program and execution, I cannot rewrite any program / firmware using COM port.
Any procedure to rewrite programs?
I spent 2 modules for this issue.

The error message is as follows:
esptool.FatalError: Failed to connect to ESP8266: Timed out waiting for packet header