You can use the nrf5sdk-tools dfu (or dfu) command to transfer a Device Firmware Update (DFU) package, for example the one you have generated using the nrf5sdk-tools pkg command, to a device compatible with the nRF5 SDK.
Make sure that the transport you select matches the DFU bootloader that is installed on the DFU target device.
Tip
For more information about the DFU process in the nRF5 SDK, see the nRF5 SDK Device Firmware Update process page.