Is it possible to change the MCUBoot Key via FOTA?

[charleshaf]

We have devices in the field with one MCUBoot Key and we'd like to get all of our devices on the same MCUBoot Key to make managing the fleet easier.

Is it possible to migrate devices over to a new MCUBoot Key?

[AHaug]

Hi,

This will depend on your firmware. It is possible to update your MCUboot with new keys given that it is a second stage bootloader and that you have NSIB/a first stage bootloader present in your application i.e support to update the second stage bootloader. 

However if you don't have this support already, and your devices are in field/production already, then it is not possible to do this without reprogramming the entire device through serial recovery and overwrite all of the firmware already present.

Kind regards,
Andreas