[atq2119]

The full bootstrapping process starts with entering instructions in binary (or hex or octal) to build an assembler in the first place :)

[swiftcoder]

The full bootstrapping process starts with a soldiering iron and a reel of copper wire.

[pabs3]

That is correct the path chosen by the Bootstrappable Builds project indeed:

https://bootstrappable.org/ https://lwn.net/Articles/983340/