nrfutil device can be used to provision cryptographic keys into the device's key storage system. The x-provision-keys subcommand acts as a transport layer for a pregenerated key file in a JSON format.
Note
This is a programming method for the nRF54L Series devices, such as the nRF54L15 DK, and the nRF54H Series devices, such as the nRF54H20 DK.