Quote from: https://foundationdevices.com/
The best security is through openness, not secrecy. Passport is open source – all software, electrical, and mechanical components are open and auditable. There is no hidden code or restricted information. You can even build a Passport yourself, from scratch!
That is interesting part that I missed. Building it myself from scratch and ten times cheaper 
Now i wonder how do we update the firmware? From microSD?
Yeah, I am sure firmware update (if they have it) will be available from microSD.