Lost mcu connection after update klipper, moonraker, OS

[Bartezan]

Printer Model: Flying Bear Ghost 5
MCU / Printerboard: MKS Robin Nano v1.1 (stm32 f103)
Host / SBC: Armbian_community 24.2.0-trunk.534 bookworm + OrangePI Zero3
klippy.log
klippy.log (124.3 KB)

Before the update, mcu communication was configured via UART5 and worked perfectly. After update, mcu could not establish a connection.
I tried: -rebuild the printer firmware - it didn’t work

• reinstal armbian OS and klipper - it didn’t work
• tried to establish a USB connection - it didn’t work

[  866.316537] usb 4-1: USB disconnect, device number 2
[  866.317437] ch341-uart ttyUSB0: ch341-uart converter now disconnected from ttyUSB0
[  866.317558] ch341 4-1:1.0: device disconnected
[ 2353.282229] systemd[2174]: memfd_create() called without MFD_EXEC or MFD_NOEXEC_SEAL set
[ 2854.984012] usb 4-1: new full-speed USB device number 3 using ohci-platform
[ 2855.209052] usb 4-1: New USB device found, idVendor=1a86, idProduct=7523, bcdDevice= 2.64
[ 2855.209097] usb 4-1: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[ 2855.209117] usb 4-1: Product: USB Serial
[ 2855.211297] ch341 4-1:1.0: ch341-uart converter detected
[ 2855.223360] usb 4-1: ch341-uart converter now attached to ttyUSB0

dmesg shows that usb was detected correctly and without errors, as far as my knowledge of linux is concerned

on stock printer firmware usb works correctly

Where else can I look to solve problems?
Sorry for low level of English

[gaolst]

Yep, your log is telling same story, USB is there, but MCU don’t answer.

When you did try to re-flash MCU what kind of error did you see ?

[Bartezan]

The firmware went through without errors. I tried to test the performance of the board on the stock firmware, and discovered that the table and stepper motor were working incorrectly. Later I discovered two burnt tracks on the board. I’ll try to fix the damage or get a new one.
Gaolst, thanks for the answer.