# MCU problems installing klipper on S1 pro

**URL:** <https://klipper.discourse.group/t/mcu-problems-installing-klipper-on-s1-pro/10345>\
**Category:** General Discussion\
**Created:** [September 7, 2023, 9:32am UTC](https://klipper.discourse.group/t/mcu-problems-installing-klipper-on-s1-pro/10345 "2023-09-07T09:32:39Z")\
**Posts on this page:** 1\
**Showing post:** 21

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**Author:** ![arqfg](https://avatars.discourse-cdn.com/v4/letter/a/e8c25b/32.png) [@arqfg](https://klipper.discourse.group/u/arqfg)\
**Post date:** [September 9, 2023, 8:22pm UTC](https://klipper.discourse.group/t/mcu-problems-installing-klipper-on-s1-pro/10345/21 "2023-09-09T20:22:14Z")

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uff finally  
i re-flash the PI (i was getting some xserver missing when installing KlipperScreen), so i had to throw post:

> [@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)

and 1-2 more and still was getting mcu  
then i reflash the printer with a firmware.bin—still MCU  
then reflash wth the klipper.bin (with the confg, i prevew post for my board) and when connect to mainsail boom…

so thanks very much @LifeOfBrian @Sineos iwont done it with out your guides XD

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