The live boot is based on NixOS and is coded in Nix, you can find the source code for it on the MTKClient-NixOS-Live-Boot GitHub
The live boot supports both 64 bit and ARM, although at the time of writing this the ARM build is untested.
Your flash drive should now be ready and bootable!
Using the live boot can depend on your specific computer. But the overall process will require you to:
This process differs across computers, and because the NixOS manual already has a description for how to go about this, it is recommended that you read that.
Read steps 1 and 2 in the “Booting from the install medium” section, pay special attention to the notes below these steps.
NixOS “Booting from the install medium” section: https://nixos.org/manual/nixos/stable/#sec-installation-booting
If all goes well you should be greeted with the xfce desktop.