If you are using the nrf5sdk-tools command, you can use the legacy commands (without nrf5sdk-tools) to display help.
For example, enter the following command to display help on the Device Firmware Update (DFU) over Bluetooth® Low Energy procedure:
nrfutil dfu ble --help
Output for nrfutil dfu ble --help
Usage: pc_nrfutil_legacy_v6.1.7.exe dfu ble [OPTIONS]
Perform a Device Firmware Update on a device with a bootloader that supports
BLE DFU. This requires a second nRF device, connected to this computer, with
connectivity firmware loaded. The connectivity device will perform the DFU
procedure onto the target device.
Options:
-pkg, --package FILE Filename of the DFU package. [required]
-ic, --conn-ic-id [NRF51|NRF52]
Connectivity IC family: NRF51 or NRF52
[required]
-p, --port TEXT Serial port COM port to which the
connectivity IC is connected.
-cd, --connect-delay INTEGER Delay in seconds before each connection to
the target device during DFU. Default is 3.
-n, --name TEXT Device name.
-a, --address TEXT BLE address of the DFU target device.
-snr, --jlink_snr TEXT Jlink serial number for the connectivity IC.
-f, --flash_connectivity Flash connectivity firmware automatically.
Default: disabled.
-mtu, --att-mtu INTEGER RANGE ATT MTU. Maximum ATT packet size for BLE
transfers. Accepted values in range [23,
247]. Default is 247. Note: Failing DFU
transmissions can in some cases be solved by
setting a lower mtu. [23<=x<=247]
--help Show this message and exit.
To display all available options for Zigbee, enter the following command:
nrfutil zigbee --help
Output for nrfutil zigbee --help
Usage: pc_nrfutil_legacy_v6.1.7.exe zigbee [OPTIONS] COMMAND [ARGS]...
Zigbee-related commands and utilities.
Options:
--help Show this message and exit.
Commands:
production_config Generate the Zigbee Production Config (version 1) hex
file.