Nano IOT & ATECC608A

Hello all :)

I was reading about the 608A and the secure boot, secure application and chain of trust which starts by securely sending microchip the key's. Is the 608 in the Nano IOT open, ie can I install my own top level certificate and lock it away permanent like or is it already provisioned?

Also are there any links to a project utilizing the Nano IOT & 608 and secure boot/application stuff?