Installation method Home Assistant OS
Core 2026.5.0
Supervisor 2026.04.2
Operating System 17.3
Frontend 20260429.3
On a bare-metal generic x86_64 installation. When plugging in ZBT-2, the device discovery runs fine, but when I try to install the Matter/Thread firmware I get:
Logger: homeassistant.components.homeassistant_hardware.firmware_config_flow
Source: components/homeassistant_hardware/firmware_config_flow.py:202
Integration: Home Assistant Hardware (documentation, issues)
First occurred: 12:36:56 AM (1 occurrence)
Last logged: 12:36:56 AM
Failed to flash firmware
Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/components/homeassistant_hardware/util.py", line 442, in async_flash_silabs_firmware
await flasher.enter_bootloader()
File "/usr/local/lib/python3.14/site-packages/universal_silabs_flasher/flasher.py", line 371, in enter_bootloader
bootloader_probe = await self.trigger_bootloader_reset(run_firmware=False)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.14/site-packages/universal_silabs_flasher/flasher.py", line 629, in trigger_bootloader_reset
await self._trigger_modem_pin_reset(rts_dtr_config)
File "/usr/local/lib/python3.14/site-packages/universal_silabs_flasher/flasher.py", line 220, in _trigger_modem_pin_reset
async with connect_protocol(
~~~~~~~~~~~~~~~~^
self._device, 115200, zigpy.serial.SerialProtocol
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
) as uart:
^
File "/usr/local/lib/python3.14/contextlib.py", line 214, in __aenter__
return await anext(self.gen)
^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.14/site-packages/universal_silabs_flasher/common.py", line 136, in connect_protocol
_, protocol = await zigpy.serial.create_serial_connection(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...<4 lines>...
)
^
File "/usr/local/lib/python3.14/site-packages/zigpy/serial.py", line 100, in create_serial_connection
transport, protocol = await serialx_create_serial_connection(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...<7 lines>...
)
^
File "/usr/local/lib/python3.14/site-packages/serialx/async_serial.py", line 277, in create_serial_connection
await transport.connect(
...<8 lines>...
)
File "/usr/local/lib/python3.14/site-packages/serialx/common.py", line 973, in connect
await self._connect(path=path, **kwargs)
File "/usr/local/lib/python3.14/site-packages/serialx/platforms/serial_posix.py", line 484, in _connect
await super()._open(normalized_path)
File "/usr/local/lib/python3.14/site-packages/serialx/descriptor_transport.py", line 83, in _open
self._fileno = await self._open_fut
^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.14/concurrent/futures/thread.py", line 86, in run
result = ctx.run(self.task)
File "/usr/local/lib/python3.14/concurrent/futures/thread.py", line 73, in run
return fn(*args, **kwargs)
FileNotFoundError: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-Nabu_Casa_ZBT-2_E072A1F7A55C-if00'
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/components/homeassistant_hardware/firmware_config_flow.py", line 202, in _install_firmware_step
await self.firmware_install_task
File "/usr/src/homeassistant/homeassistant/components/homeassistant_hardware/firmware_config_flow.py", line 308, in _install_firmware
self._probed_firmware_info = await async_flash_silabs_firmware(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...<8 lines>...
)
^
File "/usr/src/homeassistant/homeassistant/components/homeassistant_hardware/util.py", line 451, in async_flash_silabs_firmware
raise HomeAssistantError("Failed to flash firmware") from err
homeassistant.exceptions.HomeAssistantError: Failed to flash firmware
In addition, even if I use openhomefoundation tool to flash the Matter/Threads firmware before hand, it does not bypass this flow. Which seems weird.
Any way out of this?
