I'm sorry that my question landed (for whatever reason - as I said above - I was actually thinking that I posted my question in the probook hotpatch guide - I apologise) here.
I didn't know that my screen resolution (1366x768) was required in my profile. I corrected that. But I know that my laptop sports the preallocation thingy. And I also mentioned that I have got that set. It might help to mention that my current 10.12.6 was accomplished with your guide only, which worked fabulously. But I can't get the same job done (again) with 10.13.6. Funny side note: with the standard unibegast installer I did actually manage to get it booted and installed. But the post-installation didn't work out. That's the reason why I dared to come back and busy you hoping for a helping hand.
All the best