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![]() But having to worry about this every time you want to upload new code can be tedious, specially when you’re testing and debugging your code. ![]() One of the ways to solve this is holding-down the “ BOOT/FLASH” button in your ESP32 board while uploading a new sketch at the same time. This means that when you try to upload a new sketch to your ESP32, the Arduino IDE fails to connect to your board, and you get the following error message: Holding the BOOT/FLASH button Some ESP32 development boards (read Best ESP32 boards) don’t go into flashing/uploading mode automatically when uploading a new code. ![]() Learn how to fix the Fatal Error Occurred: “ Failed to connect to ESP32: Timed out waiting for packet header” error when trying to upload new code to your ESP32 board once for all. ![]()
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