How to protect an embedded device?

Question

Electronics

How can I try to protect the device on Windows? System with uefi. Booted with built-in eMMC.
So that even if you make a dump, it won't start on another system.
Can anyone suggest anything to resolve the issue.
The system is autonomous. It is physically impossible to observe her.

Answer 1

An external secure device, ideally to transfer a key part of the algorithm to it

Answer 2

A TNT checker triggered by opening the case in order to exclude the possibility of direct removal, the rest - by means of the OS. :)
Do you know what will happen if you steal a cassette with money from an ATM? Well, I don't know for sure either!
But the Internet writes, the money will be in blue. That is, they will be destroyed.