# Voron 2.4 No Mcu Found

**URL:** <https://klipper.discourse.group/t/voron-2-4-no-mcu-found/8786>\
**Category:** General Discussion\
**Created:** [June 5, 2023, 12:57am UTC](https://klipper.discourse.group/t/voron-2-4-no-mcu-found/8786 "2023-06-05T00:57:41Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![jakep\_82](https://avatars.discourse-cdn.com/v4/letter/j/ea666f/32.png) [@jakep\_82](https://klipper.discourse.group/u/jakep_82)\
**Post date:** [June 5, 2023, 5:05am UTC](https://klipper.discourse.group/t/voron-2-4-no-mcu-found/8786/2 "2023-06-05T05:05:39Z")

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> [@Debian Bullseye Bug causing Klipper to no longer find the printer board](https://klipper.discourse.group/t/debian-bullseye-bug-causing-klipper-to-no-longer-find-the-printer-board/8231):
>
> Moved to [Debian 11 (Bullseye) udev bug - No board or serial found](https://klipper.discourse.group/t/debian-11-bullseye-udev-bug-no-board-or-serial-found/10711)

Also for future reference, it’s best not to update without a specific reason. Random things can break like this upstream Debian bug, and it can cause a lot of downtime trying to fix it.

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