flashing binary onto nRF52840 USB dongle via Raspberry Pi 4

RE: flashing binary onto nRF52840 USB dongle via Raspberry Pi 4

drollinger — Sat, 03 Jan 2026 16:25:58 GMT

I have completed my project: Zephyr development environment on RPI 4 running Bookworm, compile binary and flash nRF52840 dongle. Here is a pdf describing the process.

RE: flashing binary onto nRF52840 USB dongle via Raspberry Pi 4

drollinger — Wed, 24 Dec 2025 16:19:47 GMT

So, MCUboot loaded onto the nRF52840 with SWD seems dead in the water and the nrfutil v8.11 can not communicate with it.

RE: flashing binary onto nRF52840 USB dongle via Raspberry Pi 4

drollinger — Mon, 22 Dec 2025 16:21:56 GMT

The MCUboot within the NCS 3.0.0 bootloader mcuboot boot zephyr unable to enumerate does compile and a zephyr.hex is created, and is programmed to the nRF52840 dongle.

RE: flashing binary onto nRF52840 USB dongle via Raspberry Pi 4

drollinger — Mon, 22 Dec 2025 16:19:17 GMT

Okay, The nRF52840 runs a bootloader requiring depricated commands. The RPI 4 running os bookworm can indeed run the nrfutil v8.11 from this location: https://files.nordicsemi.com/ui/native/swtools/external/nrfutil/executables/aarch64-unknown-linux-gnu/

The nrfutil v8.11 communicated with the nrf52840 usb dongle plugged into the RPI listed earlier, but the firmware on the usb dongle requires depricated commands, the depricated commands is the issue. I will attempt to reprogram the nRF52840 usb dongle with an updated bootloader over SWD compatible with the nrfutil v8.11.

RE: flashing binary onto nRF52840 USB dongle via Raspberry Pi 4

drollinger — Mon, 22 Dec 2025 12:45:59 GMT

RE: flashing binary onto nRF52840 USB dongle via Raspberry Pi 4

drollinger — Mon, 22 Dec 2025 10:53:53 GMT

Okay, 5.2 runs on Python 2 only, what is the latest nrfutil and what Python version does it run on?

RE: flashing binary onto nRF52840 USB dongle via Raspberry Pi 4

Susheel Nuguru — Wed, 17 Dec 2025 16:57:52 GMT

Great .. will keep this thread in waiting until then.

RE: flashing binary onto nRF52840 USB dongle via Raspberry Pi 4

drollinger — Wed, 17 Dec 2025 15:59:33 GMT

Thank you, the dependencies in debian always seems to be an issue. I will give it a go and get back to this post.

RE: flashing binary onto nRF52840 USB dongle via Raspberry Pi 4

Susheel Nuguru — Wed, 17 Dec 2025 11:18:12 GMT

Sorry for the late reply. Abhijith is away and could not reply to this thread. I will try to look into this.

The crash seems to happen because nrfutil 5.2 is a Python 2-only release (dict.iteritems()), so running it inside your Zephyr Python 3.13 venv will always fail.

Try setting up the dedicated nrfutil venv/pipx install and confirm nrfutil --version shows ≥6, after that re-run west flash --runner nrfutil; verify the LED blinks. if that works, capture the commands for the Raspberry Pi recipe you plan to share. I do not have any experience working with the Pi itself, but I think solving this issue with the tool version conflict should take you a bit further

RE: flashing binary onto nRF52840 USB dongle via Raspberry Pi 4

drollinger — Sat, 13 Dec 2025 13:49:35 GMT

So, does Nordicsemiconductor, not have an answer/clues/suggestions?

RE: flashing binary onto nRF52840 USB dongle via Raspberry Pi 4

drollinger — Sat, 13 Dec 2025 13:48:39 GMT

Do you give up?

RE: flashing binary onto nRF52840 USB dongle via Raspberry Pi 4

drollinger — Wed, 10 Dec 2025 19:52:14 GMT

Looking to program a USB dongle nrf52840 over USB with the nrfutil!

RE: flashing binary onto nRF52840 USB dongle via Raspberry Pi 4

drollinger — Tue, 09 Dec 2025 14:52:56 GMT

I have attached a log indicating a complete compilation of the blinky program for USB dongle nrf52840 through the zephyr development, but the inability of the nrfutil to configure a .zip file. In the specific case nrfutili 5.2 was utilized.

=~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2025.12.01 08:08:30 =~=~=~=~=~=~=~=~=~=~=~=
Using username "zephyr".
zephyr@192.168.1.146's password:
Linux ZephyrRTOS 6.12.47+rpt-rpi-v8 #1 SMP PREEMPT Debian 1:6.12.47-1+rpt1 (2025-09-16) aarch64

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Mon Dec 1 10:07:01 2025 from 192.168.1.143
(zephyr-venv) zephyr@ZephyrRTOS:~ $ # Ensure you're in the venv (if not: source ~/zephyr-venv/bin/activate)
pip install --upgrade "PyYAML>=6.0"

# Verify: No more conflicts with west/nrfutil
pip check # Should show no errors (or just warnings we can ignore)

# If pip check complains about click (from earlier), upgrade it too:
pip install --upgrade "click>=8.0"
pip check # Re-run to confirm (zephyr-venv) zephyr@ZephyrRTOS:~ $ # Ensure you're in the venv (if not: source ~/zephyr-venv/bin/activate)
pip install --upgrade "PyYAML>=6.0"

# Verify: No more conflicts with west/nrfutil
pip check # Should show no errors (or just warnings we can ignore)

# If pip check complains about click (from earlier), upgrade it too:
pip install --upgrade "click>=8.0"
pip check # Re-run to confirm
Collecting PyYAML>=6.0
Using cached pyyaml-6.0.3-cp313-cp313-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl.metadata (2.4 kB)
Using cached pyyaml-6.0.3-cp313-cp313-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl (767 kB)
Installing collected packages: PyYAML
Attempting uninstall: PyYAML
Found existing installation: PyYAML 4.2b4
Uninstalling PyYAML-4.2b4:
Successfully uninstalled PyYAML-4.2b4
ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
nrfutil 5.2.0 requires pyyaml~=4.2b1, but you have pyyaml 6.0.3 which is incompatible.
Successfully installed PyYAML-6.0.3
reuse 6.2.0 has requirement click>=8.1, but you have click 7.1.2.
nrfutil 5.2.0 has requirement pyyaml~=4.2b1, but you have pyyaml 6.0.3.
gitlint-core 0.19.1 has requirement click>=8, but you have click 7.1.2.
Collecting click>=8.0
Using cached click-8.3.1-py3-none-any.whl.metadata (2.6 kB)
Using cached click-8.3.1-py3-none-any.whl (108 kB)
Installing collected packages: click
Attempting uninstall: click
Found existing installation: click 7.1.2
Uninstalling click-7.1.2:
Successfully uninstalled click-7.1.2
ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
nrfutil 5.2.0 requires click~=7.0, but you have click 8.3.1 which is incompatible.
nrfutil 5.2.0 requires pyyaml~=4.2b1, but you have pyyaml 6.0.3 which is incompatible.
Successfully installed click-8.3.1
nrfutil 5.2.0 has requirement click~=7.0, but you have click 8.3.1.
nrfutil 5.2.0 has requirement pyyaml~=4.2b1, but you have pyyaml 6.0.3.
(zephyr-venv) zephyr@ZephyrRTOS:~ $ cd ~/zephyrproject
west build -b nrf52840dongle_nrf52840 zephyr/samples/basic/blinky --pristine cd ~/zephyrproject
west build -b nrf52840dongle_nrf52840 zephyr/samples/basic/blinky --pristine
-- west build: making build dir /home/zephyr/zephyrproject/build pristine
-- west build: generating a build system
Loading Zephyr default modules (Zephyr base).
-- Application: /home/zephyr/zephyrproject/zephyr/samples/basic/blinky
-- CMake version: 3.31.6
-- Found Python3: /home/zephyr/zephyr-venv/bin/python3 (found suitable version "3.13.5", minimum required is "3.10") found components: Interpreter
-- Cache files will be written to: /home/zephyr/.cache/zephyr
-- Zephyr version: 4.3.99 (/home/zephyr/zephyrproject/zephyr)
-- Found west (found suitable version "1.5.0", minimum required is "0.14.0")
-- Board: nrf52840dongle, qualifiers: nrf52840
-- Found host-tools: zephyr 0.17.4 (/home/zephyr/zephyr-sdk-0.17.4)
-- Found toolchain: zephyr 0.17.4 (/home/zephyr/zephyr-sdk-0.17.4)
-- Found Dtc: /home/zephyr/zephyr-sdk-0.17.4/sysroots/aarch64-pokysdk-linux/usr/bin/dtc (found suitable version "1.7.0", minimum required is "1.4.6")
-- Found BOARD.dts: /home/zephyr/zephyrproject/zephyr/boards/nordic/nrf52840dongle/nrf52840dongle_nrf52840.dts
-- Generated zephyr.dts: /home/zephyr/zephyrproject/build/zephyr/zephyr.dts
-- Generated pickled edt: /home/zephyr/zephyrproject/build/zephyr/edt.pickle
-- Generated devicetree_generated.h: /home/zephyr/zephyrproject/build/zephyr/include/generated/zephyr/devicetree_generated.h
Parsing /home/zephyr/zephyrproject/zephyr/Kconfig
Loaded configuration '/home/zephyr/zephyrproject/zephyr/boards/nordic/nrf52840dongle/nrf52840dongle_nrf52840_defconfig'
Merged configuration '/home/zephyr/zephyrproject/zephyr/samples/basic/blinky/prj.conf'
Configuration saved to '/home/zephyr/zephyrproject/build/zephyr/.config'
Kconfig header saved to '/home/zephyr/zephyrproject/build/zephyr/include/generated/zephyr/autoconf.h'
-- Found GnuLd: /home/zephyr/zephyr-sdk-0.17.4/arm-zephyr-eabi/arm-zephyr-eabi/bin/ld.bfd (found version "2.38")
-- The C compiler identification is GNU 12.2.0
-- The CXX compiler identification is GNU 12.2.0
-- The ASM compiler identification is GNU
-- Found assembler: /home/zephyr/zephyr-sdk-0.17.4/arm-zephyr-eabi/bin/arm-zephyr-eabi-gcc
-- Using ccache: /usr/bin/ccache
-- Found gen_kobject_list: /home/zephyr/zephyrproject/zephyr/scripts/build/gen_kobject_list.py
-- Configuring done (21.2s)
-- Generating done (0.5s)
-- Build files have been written to: /home/zephyr/zephyrproject/build
-- west build: building application
[0/188] Preparing syscall dependency handling [0/188] Generating include/generated/zephyr/version.h [1/188] Preparing syscall dependency handling

[1/188] Generating misc/generated/syscalls_subdirs.trigger [2/188] Generating include/generated/zephyr/version.h
-- Zephyr version: 4.3.99 (/home/zephyr/zephyrproject/zephyr), build: v4.3.0-1368-gd02cdc734e6e
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isr_tables_swi.ld [185/188] Building C object zephyr/CMa...zephyr_final.dir/misc/empty_file.c.obj [185/188] Building C object zephyr/CMakeFiles/zephyr_final.dir/isr_tables.c.obj [186/188] Building C object zephyr/CMa...zephyr_final.dir/misc/empty_file.c.obj [187/188] Building C object zephyr/CMakeFiles/zephyr_final.dir/isr_tables.c.obj [187/188] Linking C executable zephyr/zephyr.elf [188/188] Linking C executable zephyr/zephyr.elf
Memory region Used Size Region Size %age Used
FLASH: 44944 B 1020 KB 4.30%
RAM: 13560 B 256 KB 5.17%
IDT_LIST: 0 GB 32 KB 0.00%
Generating files from /home/zephyr/zephyrproject/build/zephyr/zephyr.elf for board: nrf52840dongle
(zephyr-venv) zephyr@ZephyrRTOS:~/zephyrproject $ ls /dev/ttyACM*ls /dev/ttyACM*
/dev/ttyACM0
(zephyr-venv) zephyr@ZephyrRTOS:~/zephyrproject $ nrfutil pkg generate --hw-version 52 --sd-req 0x00 --application build/zephyr/zephyr.hex --application-version 1 blinky.zip
nrfutil dfu usb-serial -pkg blinky.zip -p /dev/ttyACM0nrfutil pkg generate --hw-version 52 --sd-req 0x00 --application build/zephyr/zephyr.hex --application-version 1 blinky.zip
nrfutil dfu usb-serial -pkg blinky.zip -p /dev/ttyACM0

|===============================================================|
|## ## ### ######## ## ## #### ## ## ###### |
|## ## ## ## ## ## ## ### ## ## ### ## ## ## |
|## ## ## ## ## ## ## #### ## ## #### ## ## |
|## ## ## ## ## ######## ## ## ## ## ## ## ## ## ####|
|## ## ## ######### ## ## ## #### ## ## #### ## ## |
|## ## ## ## ## ## ## ## ### ## ## ### ## ## |
| ### ### ## ## ## ## ## ## #### ## ## ###### |
|===============================================================|
|You are not providing a signature key, which means the DFU |
|files will not be signed, and are vulnerable to tampering. |
|This is only compatible with a signature-less bootloader and is|
|not suitable for production environments. |
|===============================================================|

Traceback (most recent call last):
File "/home/zephyr/zephyr-venv/bin/nrfutil", line 7, in <module>
sys.exit(cli())
~~~^^
File "/home/zephyr/zephyr-venv/lib/python3.13/site-packages/click/core.py", line 1485, in __call__
return self.main(*args, **kwargs)
~~~~~~~~~^^^^^^^^^^^^^^^^^
File "/home/zephyr/zephyr-venv/lib/python3.13/site-packages/click/core.py", line 1406, in main
rv = self.invoke(ctx)
File "/home/zephyr/zephyr-venv/lib/python3.13/site-packages/click/core.py", line 1873, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
File "/home/zephyr/zephyr-venv/lib/python3.13/site-packages/click/core.py", line 1873, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
File "/home/zephyr/zephyr-venv/lib/python3.13/site-packages/click/core.py", line 1269, in invoke
return ctx.invoke(self.callback, **ctx.params)
~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/zephyr/zephyr-venv/lib/python3.13/site-packages/click/core.py", line 824, in invoke
return callback(*args, **kwargs)
File "/home/zephyr/zephyr-venv/lib/python3.13/site-packages/nordicsemi/__main__.py", line 867, in generate
package.generate_package(zipfile_path)
~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
File "/home/zephyr/zephyr-venv/lib/python3.13/site-packages/nordicsemi/dfu/package.py", line 403, in generate_package
for key, firmware_data in self.firmwares_data.iteritems():
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'dict' object has no attribute 'iteritems'
Usage: nrfutil dfu usb-serial [OPTIONS]
Try 'nrfutil dfu usb-serial --help' for help.

Error: Invalid value for '-pkg' / '--package': File 'blinky.zip' does not exist.
(zephyr-venv) zephyr@ZephyrRTOS:~/zephyrproject $ exit
logout

RE: flashing binary onto nRF52840 USB dongle via Raspberry Pi 4

Menon — Tue, 09 Dec 2025 13:24:27 GMT

Hello,

You can use the Insert tab to paste the logs, or you can also upload the file if you prefer to do it that way. Please also share the nRFUtil version you are using.

Kind regards,
Abhijith

RE: flashing binary onto nRF52840 USB dongle via Raspberry Pi 4

drollinger — Mon, 08 Dec 2025 19:50:09 GMT

Yes, how do I attach files?

RE: flashing binary onto nRF52840 USB dongle via Raspberry Pi 4

Menon — Mon, 08 Dec 2025 11:13:53 GMT

Hello,

Can you share the logs? The message you pasted doesn’t explain the issue it only describes some possible solutions to the issue you might be facing (though I’m not completely sure), which is a bit confusing. What version of nrfutil are you using?

Kind regards,
Abhijith

RE: flashing binary onto nRF52840 USB dongle via Raspberry Pi 4

drollinger — Fri, 05 Dec 2025 14:09:45 GMT

Yes, I am attempting to use nrfutil on a raspberry pi and it is failing.

RE: flashing binary onto nRF52840 USB dongle via Raspberry Pi 4

Menon — Fri, 05 Dec 2025 02:15:33 GMT

Hello,

So does that mean you tried nrfutil and it’s failing? Sorry, I didn’t fully understand your response.

Kind Regards,

Abhijith

RE: flashing binary onto nRF52840 USB dongle via Raspberry Pi 4

drollinger — Thu, 04 Dec 2025 17:21:31 GMT

The root cause of why nrfutil (and many related Nordic tools) keep failing on your Raspberry Pi setup in December 2025 is a combination of three things that all hit at once:

You are using Python 3.13 (Debian trixie/bookworm on Raspberry Pi OS 64-bit now ships with Python 3.13 by mid-2025).
The old Python-based nrfutil (the one from pypi.org, version 5.2.0) is completely unmaintained and does not support Python ≥ 3.8 at all. It fails in multiple ways:
- AttributeError: 'dict' object has no attribute 'iteritems' (because .iteritems() was removed in Python 3)
- module 'collections' has no attribute 'Hashable' (because in Python 3.10+ collections.Hashable became collections.abc.Hashable)
- It forces PyYAML 4.2b4, which also breaks everything else (west, pyocd, etc.)
Nordic replaced the old Python nrfutil years ago with a completely new standalone binary tool (also called nrfutil, but version 7.x/8.x). This new tool is written in Rust, distributed only as pre-built binaries, and works perfectly on Linux arm64 (including Raspberry Pi). The problem is that all the old download links you tried are either dead, redirected to HTML pages, or simply never existed for the new binary.

Summary of what went wrong in your logs

Every pip install nrfutil gave you the ancient, dead 5.2.0 version → instantly broken on Python 3.13.
Every wget …nrfutil_Linux-arm64.zip from developer.nordicsemi.com or files.nordicsemi.com downloaded an HTML redirect page (17 KB), not the real ~10–15 MB binary → unzip fails.
The GitHub releases you tried (v7.11.0, v0.16.5, etc.) simply don’t have arm64 builds or the tags don’t exist.

RE: flashing binary onto nRF52840 USB dongle via Raspberry Pi 4

Menon — Tue, 02 Dec 2025 15:50:47 GMT

Hello,

I am not sure, as I haven't tried using the dongle with a Raspberry Pi. However, have you tried using nrfutil on the Raspberry Pi to flash the dongle? For example, you could create a DFU package (blinky.zip) with nrfutil nrf5sdk-tools pkg generate blinky.zip and then flash the package using nrfutil nrf5sdk-tools dfu usb-serial -pkg blinky.zip -p /dev/ttyACM0, see this documentation on the same.

Kind Regards,

Abhijith