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I can confirm Monterey 12.2 is rolling on the EFI 5142 from Pastychefs setup. I had a few warnings from preboot (is seems) but that does not seem to have any effect on booting nor functionality, as far as I have been able to check things.

Great! Does your EFI 5142 work with Monterey?

OK, apparently I didn't read up. I was able to establish AVB on a MacBook Pro on Big Sur, but apparently my Dawkins has no hw support for thunderbolt, nor proxy-ish approaches.

Just bought an AVB-capable sound card as well and is interested in the same information. Will test myself when I get it and report results on my setup.

Well, you seem to be running a non-hack-mac so you should disregard my sidenote and indeed anything I wrote as I can nor vouch for it to be relevant at all for factory macs...

Well, I don't have any particular advice. From what I read there seems to be several paths to that error message. The only thing I can recommend relating to Big Sur is to make a clean install and use the Migration tool, which worked really nice (almost) as I commented upon here. As a sidenote...

It turned out that a clean install was the only way I could get things working. This was not too bad as I also found the migration tool which transfered user and settings without problem. There seems to be too much going on regarding security improvements in Big Sur to handle it the upgrade way...

In another thread I was struggling with getting the EFI correctly setup and a boot file in root preventing parts of the installation process. Now having all that in place I started upgrading my Mojave installation to Big Sur. I have made several attempts with reformatting of destination disks...

Well not really. The update does not seem complete. Will make another separate post on that.

Miracles to happen...with a little help. I read the error in post #18 and it indicated that the file "boot" in the root was causing the error. Well, I deleted it and ran yet another upgrade for Big Sur (actually i first made an attempt on Catalina but the result were the same and thought to...

Yes, I have a ethernet wire. The Wi-Fi has been turned off. Does that affect? Should I do Wi-Fi only?

I enclose one of the install logs from my Big Sur attempts. There is some elaboration as per below: "Jan 10 15:11:23 iMac OSInstaller[197]: Operation: Install Mobile Software Update failed, Failure Reason: Error Domain=com.apple.osinstall Code=-82 "An error occurred applying the software...

Mystery deepens even further (or may give some clues): I got corresponding errors trying to install Catalina, see enclosed images below... So regardless of Catalina or Big Sur I seem to end up with an error related to disks, again the Update assistant launches and asks me to select a startup...

Yes, got it (catalina). Will make that upgrade (hopefully uneventful) and make some further research when there is time available on OpenCore. I might just purchase another M2 memory and experiment with it on USB. I need my computer to be stable for work. Thanks again for taking time @pastrychef!

I see. OpenCore seems to be another leap which I doubt I will have time for right now. I would have been quite happy, I guess to settle for a Catalina upgrade, but it seems that I cant get it anymore. I was trying yesterday to get it from the US app store but it wasn't available. Is there a...

This happens when there is indicated 18-20 minutes left of the installation. The macOs Update Assistant launches, works there for a while and then the message in the first thread entry appear. There is an option to select start disk manually, but when the HD is chosen (there is only one option...

Ok, understood but I still get the same error as in the first entry. But I will make another restore and upgrade attempt while keeping control of startup of Install partition until it is no longer available (as I interpret it). But its still odd, I think, that I get the "unable to set startup...

Alas, this config exhibited the same behaviour. Isn't it rather odd? I restored to the backup before I made a new update attempt, so there should be no funny things there. The only impact of upgrade attempts are the additional partitions HD-Data, HD and two instances of Update partitions. The...

Here is the EFI which is installed now. Really appreciate you reaching out, @pastrychef!

So what may be causing this break in installation? Is the write lock not of significance?