nRF5340 nRF Secure Immutable Bootloader and Network core bootloader

Hello!

I have a problem updating network core firmware through MCUboot when NSIB is enabled (through "CONFIG_SECURE_BOOT=y" in my application prj.conf).

Without NSIB enabled, I can see in MCUboot logs that network core is being updated as per netboot testing tutorial (message "Done updating network core" is printed). With NSIB enabled, however, nothing network-core-related is printed by MCUboot after restarting with new network core update image written to secondary slot.

I found a related discussion, where it is stated that nRF53 is not supported by nRF Secure Immutable Bootloader:

https://devzone.nordicsemi.com/f/nordic-q-a/73819/issue-about-nrf5340-network-core-bootloader

Is that still the case? If yes, is it mentioned in documentation? Can I get more details on why exactly isn't it working? I was able to use NSIB and update MCUboot, and I can't imagine why b0 and b0n would conflict as they are completely unrelated as I see it.

nRF Connect SDK version: 1.8.0

Best regards

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