Basic Information: Printer Model: Sapphire Plus MCU / Printerboard: Octopus Pro klippy.log klippy (5).log (468.3 KB) Describe your issue: … cannot find MCU. i try to follow a guide from Sineos here ender-3-v2-linux-machine-no-mcu-found/4635/17 but i don’t get any info from this command: s…

[image] Other Single Board Computers (SBC) apart from Raspberry Pis Some distributions install services that might interfere with Klipper. Most noteworthy are ModemManager BRLTTY # List all brltty services (replace with "modemmanger" to check this) sudo systemctl list-units | grep brltty # For…

i tried sudo systemctl list-units | grep modemmanger but didn’t get any reply

Hmm, acc to your dmesg, it is active. Try dpkg -l | grep modem

[image] Sineos: dpkg -l | grep modem got this: pi@printer:~ $ dpkg -l | grep modem ii libmm-glib0:arm64 1.14.12-0.2 arm64 D-Bus service for managing modems - shared libraries ii modemmanager 1.14.12-0.2 …

run: sudo apt remove modemmanager then reboot

i did but still have the problem :frowning:

What is the output of ls /dev/serial/by-id/* Attach a new dmesg after replugging the board and a new klippy.log

pi@printer:~ $ ls /dev/serial/by-id/* ls: cannot access ‘/dev/serial/by-id/*’: No such file or directory

Reflash your board, paying extra attention to the correct make menuconfig options. Also check Debian Bullseye Bug causing Klipper to no longer find the printer board - #5 by Sineos

'mcu': Unable to open serial port

General Discussion

Morf90 May 17, 2023, 7:19pm 16

i’m also doing the steps in your linked guide

Camera not working from remote (telegram bot, octoeverywhere)

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'mcu': Unable to open serial port

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