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Raja
Raja
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I purchased a NodeMCU clone ESP32 clone ESP32 board of and encountered this error.

A fatal error occurred: Failed to connect to ESP32: Wrong boot mode detected (0x13)! The chip needs to be in download mode. [upload] Error 2

There were 2 separate problems, and I was stumped by their combined effect:

  1. Normally such boards automatically go into program upload mode using the RTS/CTS pins on the USB serial. This self-resetting mechanism did not work on my board. I had to manually press the BOOT button on GPIO0 in order to upload code.

  2. I guessed the above problem correctly, but there was an additional quirk: ESPTool sends a RESET command just before uploading the code. So you have to press the BOOT button when you see the message 'Connecting..' on the Arduino IDEwhen you see the message 'Connecting..' on the Arduino IDE. Normally we will hold the BOOT button and press reset in order to put the board in boot mode. This did not work with this board. Pressing the button at the time of power up/ connecting the USB cable etc. all failed. You have to press the BOOT button at the right time!

In addition to the Arduino IDE, I observed the same behavior with other tools like Tasmotizer. In all cases, the solution was the same.

I purchased a NodeMCU clone ESP32 board of and encountered this error.

A fatal error occurred: Failed to connect to ESP32: Wrong boot mode detected (0x13)! The chip needs to be in download mode. [upload] Error 2

There were 2 separate problems, and I was stumped by their combined effect:

  1. Normally such boards automatically go into program upload mode using the RTS/CTS pins on the USB serial. This self-resetting mechanism did not work on my board. I had to manually press the BOOT button on GPIO0 in order to upload code.

  2. I guessed the above problem correctly, but there was an additional quirk: ESPTool sends a RESET command just before uploading the code. So you have to press the BOOT button when you see the message 'Connecting..' on the Arduino IDE. Normally we will hold the BOOT button and press reset in order to put the board in boot mode. This did not work with this board. Pressing the button at the time of power up/ connecting the USB cable etc. all failed. You have to press the BOOT button at the right time!

In addition to the Arduino IDE, I observed the same behavior with other tools like Tasmotizer. In all cases, the solution was the same.

I purchased a NodeMCU clone ESP32 board and encountered this error.

A fatal error occurred: Failed to connect to ESP32: Wrong boot mode detected (0x13)! The chip needs to be in download mode. [upload] Error 2

There were 2 separate problems, and I was stumped by their combined effect:

  1. Normally such boards automatically go into program upload mode using the RTS/CTS pins on the USB serial. This self-resetting mechanism did not work on my board. I had to manually press the BOOT button on GPIO0 in order to upload code.

  2. I guessed the above problem correctly, but there was an additional quirk: ESPTool sends a RESET command just before uploading the code. So you have to press the BOOT button when you see the message 'Connecting..' on the Arduino IDE. Normally we will hold the BOOT button and press reset in order to put the board in boot mode. This did not work with this board. Pressing the button at the time of power up/ connecting the USB cable etc. all failed. You have to press the BOOT button at the right time!

In addition to the Arduino IDE, I observed the same behavior with other tools like Tasmotizer. In all cases, the solution was the same.

Repeated the error in the text, its easier to read rather than having to see if its in the title. And improved the list so it indents and wraps
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Rohit Gupta ♦
Rohit Gupta ♦
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I purchased an NodeMCU clone ESP32a NodeMCU clone ESP32 board of and encountered this error.There

A fatal error occurred: Failed to connect to ESP32: Wrong boot mode detected (0x13)! The chip needs to be in download mode. [upload] Error 2

There were 2 separate problems, and I was stumped by their combined effect:

(1) Normally such boards automatically go into program upload mode using the RTS/CTS pins on the USB serial. This self-resetting mechanism did not work on my board. I had to manually press the BOOT button on GPIO0 in order to upload code.

(2) I guessed the above problem correctly, but there was an additional quirk: ESPTool sends a RESET command just before uploading the code. So you have to press the BOOT button when you see the message 'Connecting..' on the Arduino IDE. Normally we will hold the BOOT button and press reset in order to put the board in boot mode. This did not work with this board. Pressing the button at the time of power up/ connecting the USB cable etc. all failed. You have to press the BOOT button at the right time!

  1. Normally such boards automatically go into program upload mode using the RTS/CTS pins on the USB serial. This self-resetting mechanism did not work on my board. I had to manually press the BOOT button on GPIO0 in order to upload code.

  2. I guessed the above problem correctly, but there was an additional quirk: ESPTool sends a RESET command just before uploading the code. So you have to press the BOOT button when you see the message 'Connecting..' on the Arduino IDE. Normally we will hold the BOOT button and press reset in order to put the board in boot mode. This did not work with this board. Pressing the button at the time of power up/ connecting the USB cable etc. all failed. You have to press the BOOT button at the right time!

In addition to the Arduino IDE, I observed the same behavior with other tools like Tasmotizer. In all cases, the solution was the same.

I purchased an NodeMCU clone ESP32 board of and encountered this error.There were 2 separate problems, and I was stumped by their combined effect:

(1) Normally such boards automatically go into program upload mode using the RTS/CTS pins on the USB serial. This self-resetting mechanism did not work on my board. I had to manually press the BOOT button on GPIO0 in order to upload code.

(2) I guessed the above problem correctly, but there was an additional quirk: ESPTool sends a RESET command just before uploading the code. So you have to press the BOOT button when you see the message 'Connecting..' on the Arduino IDE. Normally we will hold the BOOT button and press reset in order to put the board in boot mode. This did not work with this board. Pressing the button at the time of power up/ connecting the USB cable etc. all failed. You have to press the BOOT button at the right time!

In addition to the Arduino IDE, I observed the same behavior with other tools like Tasmotizer. In all cases, the solution was the same.

I purchased a NodeMCU clone ESP32 board of and encountered this error.

A fatal error occurred: Failed to connect to ESP32: Wrong boot mode detected (0x13)! The chip needs to be in download mode. [upload] Error 2

There were 2 separate problems, and I was stumped by their combined effect:

  1. Normally such boards automatically go into program upload mode using the RTS/CTS pins on the USB serial. This self-resetting mechanism did not work on my board. I had to manually press the BOOT button on GPIO0 in order to upload code.

  2. I guessed the above problem correctly, but there was an additional quirk: ESPTool sends a RESET command just before uploading the code. So you have to press the BOOT button when you see the message 'Connecting..' on the Arduino IDE. Normally we will hold the BOOT button and press reset in order to put the board in boot mode. This did not work with this board. Pressing the button at the time of power up/ connecting the USB cable etc. all failed. You have to press the BOOT button at the right time!

In addition to the Arduino IDE, I observed the same behavior with other tools like Tasmotizer. In all cases, the solution was the same.

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Raja
Raja
  • 141
  • 6

I purchased an NodeMCU clone ESP32 board of and encountered this error.There were 2 separate problems, and I was stumped by their combined effect:

(1) Normally such boards automatically go into program upload mode using the RTS/CTS pins on the USB serial. This self-resetting mechanism did not work on my board. I had to manually press the BOOT button on GPIO0 in order to upload code.

(2) I guessed the above problem correctly, but there was an additional quirk: ESPTool sends a RESET command just before uploading the code. So you have to press the BOOT button when you see the message 'Connecting..' on the Arduino IDE. Normally we will hold the BOOT button and press reset in order to put the board in boot mode. This did not work with this board. Pressing the button at the time of power up/ connecting the USB cable etc. all failed. You have to press the BOOT button at the right time!

In addition to the Arduino IDE, I observed the same behavior with other tools like Tasmotizer. In all cases, the solution was the same.

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