Hello there 
We seem to have a similar problem as this thread: nrf54h20-dk flash failed.
After trying to first flash the dk normally via VS Code, I found and followed this tutorial: https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/app_dev/device_guides/working_with_nrf/nrf54h/ug_nrf54h20_gs.html#ug-nrf54h20-gs)
Then I tried to flash the dk again with the Blinky example code via VS Code, which was "successfull", however the board did not blink as expected.
After that, I saw the other thread, that this may be the issue and followed the instructions and used the following commands:
nrfutil device x-boot-mode-set --boot-mode safe --traits jlink
nrfutil device erase --all --log-level trace --core Application --traits jlink
nrfutil device erase --all --log-level trace --core Network --traits jlink
nrfutil device x-boot-mode-set --boot-mode normal --traits jlink
However, now when trying to flash the BICR again, the following error appears:
[Serial No.] Failed, [Probe] Device is protected...
I tried running nrfutil device recover, which runs successfully, however the error message still appears.
Please advise on how to continue.
Regards