Run nrfutil nrf5sdk-tools pkg generate to generate a ZIP package for distribution to applications that support Nordic DFU OTA. You can then use the file with a mobile application or another tool to update the firmware of a device compatible with the nRF5 SDK.
The application, bootloader, and SoftDevice files are converted to BIN if supplied as HEX files before being included in the package.
For more information on the generated packages, see the DFU package combinations page and the nRF5 SDK documentation.