You can accomplish the security update by uploading any Arduino Cloud IoT Thing sketch to the board, just as usual. Arduino Cloud will automatically make the security update when you do that.
Please let us know if you have any questions or problems while doing that.
Thank you very much for all the assistance i received on this platform. It seems like out of the blue today I just managed to upload the sketch that was just giving errors previously.
I see these messages on all my Devices too, and the update worked fine... for the one I have at home. But because I'm using the Nano 33 IoT, one of them is remote in the field. I cannot get to it to physically connect it to my laptop to do this update.
How can I update it remotely? It's crazy NOT to be able to do an OTA firmware upgrade on a device that is specifically meant to be used for wireless IoT projects.