Perhaps some individual kept a copy of the K4 demo firmware, but as a site, it has never been among the "recovery images" made available.
Your best bet for learning about what is being done is to look up the original "de-bricking" threads.
In those, people had to do all the commands "by hand" without any automation to help.
The Kubrick "Wizard" just (no offense intended ixtab) automates the process.
Making it much easier on the end-user but less informative.
The Kubrick LiveCD has most of those 'old' utilities already built and installed (has to, since the 'Wizard' uses them).
ixtab has include an escape from the 'Wizard' to the command line shell in Kubrick.
(Check his documentation - I don't recall what it is.)