# Failing to flash Ender3 v2 **URL:** \ **Category:** General Discussion\ **Created:** [July 1, 2025, 9:16pm UTC](https://klipper.discourse.group/t/failing-to-flash-ender3-v2/24083 "2025-07-01T21:16:04Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![BoguesUser](https://avatars.discourse-cdn.com/v4/letter/b/c37758/32.png) [@BoguesUser](https://klipper.discourse.group/u/BoguesUser)\ **Post date:** [July 1, 2025, 9:16pm UTC](https://klipper.discourse.group/t/failing-to-flash-ender3-v2/24083/1 "2025-07-01T21:16:04Z")
### 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 ```auto 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 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 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](https://global.discourse-cdn.com/free1/uploads/klipper/original/3X/b/0/b07e915e7a316e3d9a71965c8ec8bcd30bf737da.png) Any ideas of what to do or try here? ---
**Author:** ![Sineos](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/sineos/32/18_2.png) [@Sineos](https://klipper.discourse.group/u/Sineos)\ **Post date:** [July 2, 2025, 5:51am UTC](https://klipper.discourse.group/t/failing-to-flash-ender3-v2/24083/2 "2025-07-02T05:51:04Z")
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](https://klipper.discourse.group/t/issues-flashing-the-printer-board/14015) ---
**Author:** ![BoguesUser](https://avatars.discourse-cdn.com/v4/letter/b/c37758/32.png) [@BoguesUser](https://klipper.discourse.group/u/BoguesUser)\ **Post date:** [July 2, 2025, 6:30am UTC](https://klipper.discourse.group/t/failing-to-flash-ender3-v2/24083/3 "2025-07-02T06:30:44Z")
GD as in Giga device right? The board has a giga device chip on it. ![signal-2025-07-02-01-27-56-875](https://global.discourse-cdn.com/free1/uploads/klipper/original/3X/f/8/f89c1d384ec05588bd41c68f69ca10b2e92c9371.jpeg) 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. ---
**Author:** ![BoguesUser](https://avatars.discourse-cdn.com/v4/letter/b/c37758/32.png) [@BoguesUser](https://klipper.discourse.group/u/BoguesUser)\ **Post date:** [July 7, 2025, 11:03pm UTC](https://klipper.discourse.group/t/failing-to-flash-ender3-v2/24083/4 "2025-07-07T23:03:07Z")
Is there any output I should expect from the printer on successful flash aside from it showing up in klipper? I’ve also tried flashing the firmware binary found {here}([Support for new Creality boards 4.2.2 with GD32F303 - #30 by d00vy](https://klipper.discourse.group/t/support-for-new-creality-boards-4-2-2-with-gd32f303/3016/30)) but it doesn’t seem to work. I’ve tried with and without the LCD plugged in also. Nothing shows up when I run `ls /dev/serial/by-id/*` ---
**Author:** ![BoguesUser](https://avatars.discourse-cdn.com/v4/letter/b/c37758/32.png) [@BoguesUser](https://klipper.discourse.group/u/BoguesUser)\ **Post date:** [July 7, 2025, 11:27pm UTC](https://klipper.discourse.group/t/failing-to-flash-ender3-v2/24083/5 "2025-07-07T23:27:14Z")
Ok. So it turns out most all my micro use cables data transfer is broken except for the one I just tried. That’s was likely the issue the entire time… Now if you excuse me, I must scream at the heavens. ---
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/64419bf2aac6639e6ef5cef200dcd456b0a01ac3.png) [@system](https://klipper.discourse.group/u/system)\ **Post date:** [August 7, 2025, 9:28am UTC](https://klipper.discourse.group/t/failing-to-flash-ender3-v2/24083/6 "2025-08-07T09:28:00Z")
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