Hello, I recently bought an ESP32 and I tried to upload a very simple LED blinking code on it, but it will keep saying "A fatal error occurred: MD5 of file does not match data in flash!", Here is the output : Sketch uses 236793 bytes (18%) of program storage space. Maximum is 1310720 bytes. Global…

I think that means your ESP32 board is faulty. Return it for a replacement.

You don't think what? If you think the board is not faulty, what do you think the problem is?

What software? Don't you think such a severe fault would have been discovered and fixed by now? Many forum members here use ESP32 boards frequently. Such a severe problem would have been discussed many times, but I'm not aware that it has been.

I use "ESP32 dev bd.", the generic at the top of the list.

i tried the cmd esptool.py method but it wont work

i burned the bootloader through arduino ide and it wont work

i found a picture with a title with the same error and it includes a magnified esp32 chip with shorted pins

Here is something to try: [ESP32 & ESP8266 - A fatal error occurred: MD5 of file does not match data in flash!]

My code will not be uploaded to ESP32

Development Tools Uploading

PaulRB March 26, 2024, 4:46pm 15

What command did you try on windows? Did you get an error message?

Topic		Replies	Views
A fatal error occurred: MD5 of file does not match data in flash! Uploading	2	1641	August 31, 2023
Arduino ide ERROR compile and upload sketch Uploading	11	1056	November 12, 2023
ESP32 WROOM D32 fatal error during flash Hardware Development	3	1690	December 13, 2022
Issue with uploading code to ESP32 board: "Unable to verify flash chip connection" Uploading	18	9577	November 11, 2025
ESP 32 code not uploading Uploading	8	790	February 27, 2026

My code will not be uploaded to ESP32

Related topics