Failing to flash Ender3 v2

General Discussion
1

Basic Information:

Printer Model: Ender 3 v2 2020 2023
MCU / Printerboard: Creality 4.2.2 board
Host / SBC : Pi Zero. Also tried Pi 5
klippy.log

Starting Klippy...
Args: ['/home/alex/klipper/klippy/klippy.py', '/home/alex/printer_data/config/printer.cfg', '-I', '/home/alex/printer_data/comms/klippy.serial', '-l', '/home/alex/printer_data/logs/klippy.log', '-a', '/home/alex/printer_data/comms/klippy.sock']
Git version: 'v0.13.0-154-g9346ad191'
Branch: master
Remote: origin
Tracked URL: https://github.com/Klipper3d/klipper
CPU: 1 core ARMv6-compatible processor rev 7 (v6l)
Python: '3.11.2 (main, Apr 28 2025, 14:11:48) [GCC 12.2.0]'
Building C code module c_helper.so
Start printer at Tue Jul  1 14:33:38 2025 (1751398418.4 3404.5)
===== Config file =====
[stepper_x]
step_pin = PC2
dir_pin = PB9
enable_pin = !PC3
microsteps = 16
rotation_distance = 40
endstop_pin = ^PA5
position_endstop = 0
position_max = 235
homing_speed = 50

[stepper_y]
step_pin = PB8
dir_pin = PB7
enable_pin = !PC3
microsteps = 16
rotation_distance = 40
endstop_pin = ^PA6
position_endstop = 0
position_max = 235
homing_speed = 50

[stepper_z]
step_pin = PB6
dir_pin = !PB5
enable_pin = !PC3
microsteps = 16
rotation_distance = 8
endstop_pin = ^PA7
position_endstop = 0.0
position_max = 250

[extruder]
max_extrude_only_distance = 100.0
step_pin = PB4
dir_pin = PB3
enable_pin = !PC3
microsteps = 16
rotation_distance = 34.406
nozzle_diameter = 0.400
filament_diameter = 1.750
heater_pin = PA1
sensor_type = EPCOS 100K B57560G104F
sensor_pin = PC5
control = pid
pid_kp = 21.527
pid_ki = 1.063
pid_kd = 108.982
min_temp = 0
max_temp = 250

[heater_bed]
heater_pin = PA2
sensor_type = EPCOS 100K B57560G104F
sensor_pin = PC4
control = pid
pid_kp = 54.027
pid_ki = 0.770
pid_kd = 948.182
min_temp = 0
max_temp = 130

[fan]
pin = PA0

[mcu]
serial = /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0
restart_method = command

[printer]
kinematics = cartesian
max_velocity = 300
max_accel = 3000
max_z_velocity = 5
max_z_accel = 100
=======================
Extruder max_extrude_ratio=0.266081
mcu 'mcu': Starting serial connect
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
webhooks client 3043362576: New connection
webhooks client 3043362576: Client info {'program': 'Moonraker', 'version': 'v0.9.3-74-g1c12414'}
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
MCU error during connect
Traceback (most recent call last):
  File "/home/alex/klipper/klippy/mcu.py", line 799, in _mcu_identify
    self._serial.connect_uart(self._serialport, self._baud, rts)
  File "/home/alex/klipper/klippy/serialhdl.py", line 183, in connect_uart
    self._error("Unable to connect")
  File "/home/alex/klipper/klippy/serialhdl.py", line 61, in _error
    raise error(self.warn_prefix + (msg % params))
serialhdl.error: mcu 'mcu': Unable to connect

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/alex/klipper/klippy/klippy.py", line 131, in _connect
    self.send_event("klippy:mcu_identify")
  File "/home/alex/klipper/klippy/klippy.py", line 223, in send_event
    return [cb(*params) for cb in self.event_handlers.get(event, [])]
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/alex/klipper/klippy/klippy.py", line 223, in <listcomp>
    return [cb(*params) for cb in self.event_handlers.get(event, [])]
            ^^^^^^^^^^^
  File "/home/alex/klipper/klippy/mcu.py", line 804, in _mcu_identify
    raise error(str(e))
mcu.error: mcu 'mcu': Unable to connect
mcu 'mcu': Unable to connect
Once the underlying issue is corrected, use the
"FIRMWARE_RESTART" command to reset the firmware, reload the
config, and restart the host software.
Error configuring printer

Build file /home/alex/klipper/klippy/../.config(3968): Tue Jul  1 14:35:01 2025
========= Last MCU build config =========
CONFIG_LOW_LEVEL_OPTIONS=y
# CONFIG_MACH_AVR is not set
# CONFIG_MACH_ATSAM is not set
# CONFIG_MACH_ATSAMD is not set
# CONFIG_MACH_LPC176X is not set
CONFIG_MACH_STM32=y
# CONFIG_MACH_HC32F460 is not set
# CONFIG_MACH_RPXXXX is not set
# CONFIG_MACH_PRU is not set
# CONFIG_MACH_AR100 is not set
# CONFIG_MACH_LINUX is not set
# CONFIG_MACH_SIMU is not set
CONFIG_BOARD_DIRECTORY="stm32"
CONFIG_MCU="stm32f103xe"
CONFIG_CLOCK_FREQ=72000000
CONFIG_SERIAL=y
CONFIG_FLASH_SIZE=0x10000
CONFIG_FLASH_BOOT_ADDRESS=0x8000000
CONFIG_RAM_START=0x20000000
CONFIG_RAM_SIZE=0x5000
CONFIG_STACK_SIZE=512
CONFIG_FLASH_APPLICATION_ADDRESS=0x8007000
CONFIG_STM32_SELECT=y
CONFIG_MACH_STM32F103=y
# CONFIG_MACH_STM32F207 is not set
# CONFIG_MACH_STM32F401 is not set
# CONFIG_MACH_STM32F405 is not set
# CONFIG_MACH_STM32F407 is not set
# CONFIG_MACH_STM32F429 is not set
# CONFIG_MACH_STM32F446 is not set
# CONFIG_MACH_STM32F765 is not set
# CONFIG_MACH_STM32F031 is not set
# CONFIG_MACH_STM32F042 is not set
# CONFIG_MACH_STM32F070 is not set
# CONFIG_MACH_STM32F072 is not set
# CONFIG_MACH_STM32G070 is not set
# CONFIG_MACH_STM32G071 is not set
# CONFIG_MACH_STM32G0B0 is not set
# CONFIG_MACH_STM32G0B1 is not set
# CONFIG_MACH_STM32G431 is not set
# CONFIG_MACH_STM32G474 is not set
# CONFIG_MACH_STM32H723 is not set
# CONFIG_MACH_STM32H743 is not set
# CONFIG_MACH_STM32H750 is not set
# CONFIG_MACH_STM32L412 is not set
# CONFIG_MACH_N32G452 is not set
# CONFIG_MACH_N32G455 is not set
# CONFIG_MACH_STM32F103x6 is not set
CONFIG_MACH_STM32F1=y
CONFIG_HAVE_STM32_USBFS=y
CONFIG_HAVE_STM32_CANBUS=y
CONFIG_STM32F103GD_DISABLE_SWD=y
CONFIG_STM32_DFU_ROM_ADDRESS=0
# CONFIG_STM32_FLASH_START_2000 is not set
# CONFIG_STM32_FLASH_START_5000 is not set
CONFIG_STM32_FLASH_START_7000=y
# CONFIG_STM32_FLASH_START_8000 is not set
# CONFIG_STM32_FLASH_START_8800 is not set
# CONFIG_STM32_FLASH_START_9000 is not set
# CONFIG_STM32_FLASH_START_10000 is not set
# CONFIG_STM32_FLASH_START_800 is not set
# CONFIG_STM32_FLASH_START_1000 is not set
# CONFIG_STM32_FLASH_START_4000 is not set
# CONFIG_STM32_FLASH_START_0000 is not set
CONFIG_STM32_CLOCK_REF_8M=y
# CONFIG_STM32_CLOCK_REF_12M is not set
# CONFIG_STM32_CLOCK_REF_16M is not set
# CONFIG_STM32_CLOCK_REF_20M is not set
# CONFIG_STM32_CLOCK_REF_24M is not set
# CONFIG_STM32_CLOCK_REF_25M is not set
# CONFIG_STM32_CLOCK_REF_INTERNAL is not set
CONFIG_CLOCK_REF_FREQ=8000000
CONFIG_STM32F0_TRIM=16
# CONFIG_STM32_USB_PA11_PA12 is not set
CONFIG_STM32_SERIAL_USART1=y
# CONFIG_STM32_SERIAL_USART1_ALT_PB7_PB6 is not set
# CONFIG_STM32_SERIAL_USART2 is not set
# CONFIG_STM32_SERIAL_USART2_ALT_PD6_PD5 is not set
# CONFIG_STM32_SERIAL_USART3 is not set
# CONFIG_STM32_SERIAL_USART3_ALT_PD9_PD8 is not set
# CONFIG_STM32_CANBUS_PA11_PA12 is not set
# CONFIG_STM32_CANBUS_PA11_PB9 is not set
# CONFIG_STM32_MMENU_CANBUS_PB8_PB9 is not set
# CONFIG_STM32_MMENU_CANBUS_PD0_PD1 is not set
CONFIG_SERIAL_BAUD=250000
CONFIG_USB_VENDOR_ID=0x1d50
CONFIG_USB_DEVICE_ID=0x614e
CONFIG_USB_SERIAL_NUMBER="12345"
CONFIG_WANT_ADC=y
CONFIG_WANT_SPI=y
CONFIG_WANT_SOFTWARE_SPI=y
CONFIG_WANT_I2C=y
CONFIG_WANT_SOFTWARE_I2C=y
CONFIG_WANT_HARD_PWM=y
CONFIG_WANT_BUTTONS=y
CONFIG_WANT_TMCUART=y
CONFIG_WANT_NEOPIXEL=y
CONFIG_WANT_PULSE_COUNTER=y
CONFIG_WANT_ST7920=y
CONFIG_WANT_HD44780=y
CONFIG_WANT_ADXL345=y
CONFIG_WANT_LIS2DW=y
CONFIG_WANT_MPU9250=y
CONFIG_WANT_ICM20948=y
CONFIG_WANT_THERMOCOUPLE=y
CONFIG_WANT_HX71X=y
CONFIG_WANT_ADS1220=y
CONFIG_WANT_LDC1612=y
CONFIG_WANT_SENSOR_ANGLE=y
CONFIG_NEED_SENSOR_BULK=y
CONFIG_WANT_LOAD_CELL_PROBE=y
CONFIG_NEED_SOS_FILTER=y
CONFIG_CANBUS_FREQUENCY=1000000
CONFIG_INLINE_STEPPER_HACK=y
CONFIG_HAVE_STEPPER_OPTIMIZED_BOTH_EDGE=y
CONFIG_WANT_STEPPER_OPTIMIZED_BOTH_EDGE=y
CONFIG_INITIAL_PINS=""
CONFIG_HAVE_GPIO=y
CONFIG_HAVE_GPIO_ADC=y
CONFIG_HAVE_GPIO_SPI=y
CONFIG_HAVE_GPIO_I2C=y
CONFIG_HAVE_GPIO_HARD_PWM=y
CONFIG_HAVE_STRICT_TIMING=y
CONFIG_HAVE_CHIPID=y
CONFIG_HAVE_BOOTLOADER_REQUEST=y
=======================
No build file /home/alex/klipper/klippy/../out/klipper.dict
No build file /home/alex/klipper/klippy/../out/klipper.elf
webhooks client 3043362576: Disconnected
webhooks client 3043416176: New connection
webhooks client 3043416176: Client info {'program': 'Moonraker', 'version': 'v0.9.3-85-g6ff9a7c'}
Unable to issue reset command on MCU 'mcu'
webhooks client 3043416176: Disconnected
Restarting printer
Start printer at Tue Jul  1 15:39:09 2025 (1751402349.8 7335.9)
===== Config file =====
[stepper_x]
step_pin = PC2
dir_pin = PB9
enable_pin = !PC3
microsteps = 16
rotation_distance = 40
endstop_pin = ^PA5
position_endstop = 0
position_max = 235
homing_speed = 50

[stepper_y]
step_pin = PB8
dir_pin = PB7
enable_pin = !PC3
microsteps = 16
rotation_distance = 40
endstop_pin = ^PA6
position_endstop = 0
position_max = 235
homing_speed = 50

[stepper_z]
step_pin = PB6
dir_pin = !PB5
enable_pin = !PC3
microsteps = 16
rotation_distance = 8
endstop_pin = ^PA7
position_endstop = 0.0
position_max = 250

[extruder]
max_extrude_only_distance = 100.0
step_pin = PB4
dir_pin = PB3
enable_pin = !PC3
microsteps = 16
rotation_distance = 34.406
nozzle_diameter = 0.400
filament_diameter = 1.750
heater_pin = PA1
sensor_type = EPCOS 100K B57560G104F
sensor_pin = PC5
control = pid
pid_kp = 21.527
pid_ki = 1.063
pid_kd = 108.982
min_temp = 0
max_temp = 250

[heater_bed]
heater_pin = PA2
sensor_type = EPCOS 100K B57560G104F
sensor_pin = PC4
control = pid
pid_kp = 54.027
pid_ki = 0.770
pid_kd = 948.182
min_temp = 0
max_temp = 130

[fan]
pin = PA0

[mcu]
serial = /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0
restart_method = command

[printer]
kinematics = cartesian
max_velocity = 300
max_accel = 3000
max_z_velocity = 5
max_z_accel = 100
=======================
Extruder max_extrude_ratio=0.266081
mcu 'mcu': Starting serial connect
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
webhooks client 3044207024: New connection
webhooks client 3044207024: Client info {'program': 'Moonraker', 'version': 'v0.9.3-85-g6ff9a7c'}
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
Starting Klippy...
Args: ['/home/alex/klipper/klippy/klippy.py', '/home/alex/printer_data/config/printer.cfg', '-I', '/home/alex/printer_data/comms/klippy.serial', '-l', '/home/alex/printer_data/logs/klippy.log', '-a', '/home/alex/printer_data/comms/klippy.sock']
Git version: 'v0.13.0-154-g9346ad191'
Branch: master
Remote: origin
Tracked URL: https://github.com/Klipper3d/klipper
CPU: 1 core ARMv6-compatible processor rev 7 (v6l)
Python: '3.11.2 (main, Apr 28 2025, 14:11:48) [GCC 12.2.0]'
Start printer at Tue Jul  1 15:40:54 2025 (1751402454.8 59.8)
===== Config file =====
[stepper_x]
step_pin = PC2
dir_pin = PB9
enable_pin = !PC3
microsteps = 16
rotation_distance = 40
endstop_pin = ^PA5
position_endstop = 0
position_max = 235
homing_speed = 50

[stepper_y]
step_pin = PB8
dir_pin = PB7
enable_pin = !PC3
microsteps = 16
rotation_distance = 40
endstop_pin = ^PA6
position_endstop = 0
position_max = 235
homing_speed = 50

[stepper_z]
step_pin = PB6
dir_pin = !PB5
enable_pin = !PC3
microsteps = 16
rotation_distance = 8
endstop_pin = ^PA7
position_endstop = 0.0
position_max = 250

[extruder]
max_extrude_only_distance = 100.0
step_pin = PB4
dir_pin = PB3
enable_pin = !PC3
microsteps = 16
rotation_distance = 34.406
nozzle_diameter = 0.400
filament_diameter = 1.750
heater_pin = PA1
sensor_type = EPCOS 100K B57560G104F
sensor_pin = PC5
control = pid
pid_kp = 21.527
pid_ki = 1.063
pid_kd = 108.982
min_temp = 0
max_temp = 250

[heater_bed]
heater_pin = PA2
sensor_type = EPCOS 100K B57560G104F
sensor_pin = PC4
control = pid
pid_kp = 54.027
pid_ki = 0.770
pid_kd = 948.182
min_temp = 0
max_temp = 130

[fan]
pin = PA0

[mcu]
serial = /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0
restart_method = command

[printer]
kinematics = cartesian
max_velocity = 300
max_accel = 3000
max_z_velocity = 5
max_z_accel = 100
=======================
Extruder max_extrude_ratio=0.266081
mcu 'mcu': Starting serial connect
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
webhooks client 3038197296: New connection
webhooks client 3038197296: Client info {'program': 'Moonraker', 'version': 'v0.9.3-85-g6ff9a7c'}
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'
MCU error during connect
Traceback (most recent call last):
  File "/home/alex/klipper/klippy/mcu.py", line 799, in _mcu_identify
    self._serial.connect_uart(self._serialport, self._baud, rts)
  File "/home/alex/klipper/klippy/serialhdl.py", line 183, in connect_uart
    self._error("Unable to connect")
  File "/home/alex/klipper/klippy/serialhdl.py", line 61, in _error
    raise error(self.warn_prefix + (msg % params))
serialhdl.error: mcu 'mcu': Unable to connect

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/alex/klipper/klippy/klippy.py", line 131, in _connect
    self.send_event("klippy:mcu_identify")
  File "/home/alex/klipper/klippy/klippy.py", line 223, in send_event
    return [cb(*params) for cb in self.event_handlers.get(event, [])]
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/alex/klipper/klippy/klippy.py", line 223, in <listcomp>
    return [cb(*params) for cb in self.event_handlers.get(event, [])]
            ^^^^^^^^^^^
  File "/home/alex/klipper/klippy/mcu.py", line 804, in _mcu_identify
    raise error(str(e))
mcu.error: mcu 'mcu': Unable to connect
mcu 'mcu': Unable to connect
Once the underlying issue is corrected, use the
"FIRMWARE_RESTART" command to reset the firmware, reload the
config, and restart the host software.
Error configuring printer

No build file /home/alex/klipper/klippy/../.config
No build file /home/alex/klipper/klippy/../out/klipper.dict
No build file /home/alex/klipper/klippy/../out/klipper.elf

Describe your issue:

I’ve been attempting to flash an ender 3 v2 with no luck.
I’ve tried:
multiple SD cards
reinstalled klipper
reinstalled the pi’s os
updated everything
yelled at it

Nothing has worked so far. I’m left with a screen that says creality, a blinking red probe, and no way to connect to printer.

Marlin flashes just fine with no issues. I just can’t get klipper to flash for some reason.

image
image1631×1121 88.5 KB

Any ideas of what to do or try here?

2

The Disable SWD setting is most likely incorrect unless you have visually verified that it is a GD chip on your board. Otherwise, see Issues flashing the printer board

3

GD as in Giga device right?

The board has a giga device chip on it.

signal-2025-07-02-01-27-56-875
signal-2025-07-02-01-27-56-8751920×1446 273 KB

I previously read through the page you link but it hasn’t been helpful for my issue unfortunately. I may have missed something but can’t quite figure out what that would be.