My project has a nrf5340+external flash, and an external USB-C connector. The device exposes a USB file system (FAT) which is hosted on the external flash partition, and appears as an external disk when connected to a host. This all works well and is used to update config, image files etc for the device to use.
I would like to be able to do application / network firmware updates by simply copying the new image (hex or bin) to this file system and rebooting. Has anyone done this? I'm guessing it involves using MCUBoot bootloader and copying the image into the secondary image slot somehow? I also want to put the secondard image slot on my external flash as won't have space on the internal flash - even better would be if MCUBoot could take the image directly from the file in the FS....
by the way, to be clear, I do NOT want to use the 'DFU over USB serial emulation' method, as this requires the user to install the specific tool to the host machine, which may not be available for their host or may not be allowed by IT policy (or by their level of expertise...).
thanks for any pointers!