# Urgent: A fatal error occurred: Failed to connect to ESP32: No serial data received

**URL:** <https://forum.arduino.cc/t/urgent-a-fatal-error-occurred-failed-to-connect-to-esp32-no-serial-data-received/1267458>\
**Category:** Uploading\
**Created:** [June 3, 2024, 1:13pm UTC](https://forum.arduino.cc/t/urgent-a-fatal-error-occurred-failed-to-connect-to-esp32-no-serial-data-received/1267458 "2024-06-03T13:13:56Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![qubits-us](https://avatars.discourse-cdn.com/v4/letter/q/5daacb/32.png) [@qubits-us](https://forum.arduino.cc/u/qubits-us)\
**Post date:** [June 3, 2024, 2:59pm UTC](https://forum.arduino.cc/t/urgent-a-fatal-error-occurred-failed-to-connect-to-esp32-no-serial-data-received/1267458/2 "2024-06-03T14:59:41Z")

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Hi @valkyrie2811 ,

Welcome to the forum..

Could be a few different things..

You don't give allot of information..

If it's Windows then possible that a recent os update changes your drivers..

[Look here first, see if it helps..](https://forum.arduino.cc/t/a-fatal-error-occurred-failed-to-connect-to-esp32-no-serial-data-received/1185060)

else need more info..

happened too me a few weeks ago, windows 11 and a esp32cam..  
i got "a device attached to the system is not functioning properly" something like it anyways..  
downgraded my driver and i was coding again..

good luck.. ~q

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