nRF Util v6.1.0

Generating DFU packages

The pkg command generates a package to use for a Device Firmware Update (DFU). The package contains the new firmware image, an init packet, and a manifest file that indicates the package format. The command can also be used to display the package contents.

Run nrfutil pkg generate to generate a zip file that you can use later with a mobile application or another tool to update the firmware of an nRF5 device. You can see available options by entering the following command:

nrfutil pkg generate --help

Run nrfutil pkg display to display the contents of a package.

For example, enter the following command to generate an unsigned package called app_dfu_package.zip from the application file app.hex:
nrfutil pkg generate --application app.hex app_dfu_package.zip
Enter the following command to generate a package called app_dfu_package.zip from the application file app.hex with application version 4 that requires hardware version 51 and SoftDevice S130 v2.0.0 (0x80) and is signed with the private key that is stored in key.pem:
nrfutil pkg generate --hw-version 51 --sd-req 0x80 --application-version 4 --application app.hex --key-file key.pem app_dfu_package.zip

Enter the following command to generate an unsigned debug package without version information from the application file app.hex:

nrfutil pkg generate --debug-mode --application app.hex app_dfu_package.zip
Enter the following command to display the contents of the created package:
nrfutil pkg display app_dfu_package.zip

The --hw-version option must correspond to the nRF5 device used.

The --sd-req option must correspond to the firmware ID of the SoftDevice present on the target device. Refer to the list of SoftDevice firmware IDs (under --sd-req) displayed by the nrfutil pkg generate --help command.

Note: While Thread and Zigbee stacks do not use a SoftDevice, the --sd-req option is required for compatibility. Any value provided for this option is ignored during the DFU.

Not all combinations of Bootloader, SoftDevice, and Application are possible when generating a package. See Supported Bootloader, SoftDevice, and Application combinations for more information.