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Thx!

Probably caused by experimenting with multiple boot-drives, MacOS, Ubunt, Windows . . . . Overview of current EFI partition attached. I guess it is still a bit cluttered, some of the SMC kexts are not relevant for a desktop?

Looking at System Information: NVMExpress = 2TB SSD (Big Sur) in DiskUtility this SSD shows as PCI-Express internal physical disk ATA = 1TB SSD (Big Sur clone) + 480GB SSD (Monterey Public Beta)+ 4x HDD The external HDD was only an (additional) backup for safety, and was not used for booting...

Well, I finally succeeded! MacOS 11.5.1 installed and fully functioning on Samsung SSD 970 EVO Plus 2TB Media (PCI-Express) Probably some of the steps below are, looking back at the trial and error, not really needed in the future but I had success! Steps followed (containing quite a lot of...

Already removed I see. I'll post again tomorrow without serial# and link, didn't think about that that, my enthousiasm. The link is still accessible in your reply, btw.

@UtterDisbelief @c-o-pr Obviously no intention to stress anyone's data bandwith, just not releasing is was sending such a huge image, which I, by the way, removed from the thread.

You're right, didn't realize I sent a picture that is originally an Apple HEIC picture from an iPhone

Well: I modified the EFI folder on the main SSD (10.15) now only containing the folder EFI with subfolders OC and BOOT. Rebooted: everything works as it should. Cloned the main SSD (2TB, which has enough free space) to the reformatted 1TB drive, copied the EFI partition of the 2TB SSD to the...

Wow, that is a very good and educational howto therr. Thank you, work to do tomorrow (it’s 10pm in my part of the world now).

Thx both, I am currently cloning the Catalina boot drive again. That done, following the instructions earlier, I'll modify the contents of the EFI partition on the cloned Catalina boot drive. If the cloned Catalina boots without problems, I will try installing Big Sur on the clone . . .

Okay, So looking at the attached image, what should be deleted or moved?

Tried all the suggestions in this thread but: no luck. At the end I cloned my boot drive (10.15.7 internal SSD (SATA)) using 'Super Duper!' to a second internal SSD. Checked both EFI-Folders (made sure they are identiacal), Rebooted to the clone, no problems, Used 'macOS Big Sur Install' to...

That is because the initial question was about the fact that an external USB3 Big Sur boot drive has no problems booting this Hackintosh. When cloning the drive to an intern SATA SSD using the latest release of CCC or SuperDuper! the intenal drive does not continue booting. The booting drive is...

Well, the Big Sur boot drive (disk 9) is a 500GB GUID SSD. The disk with the error, is disk 4 which when giving the error message was GUID partitioned, as you can see the error no longer occured when APM partioned. So I am not trying to install Big Sur on an APM drive. Just trying to get rid of...

To try getting rid af that error I changed the partion type on that drive from GUID to APM. The verbose output is different now. But no finished booting.

Picture attached.

Removed from DeviceProperties Disabled in 'Kernel' Enabled in Kernel settings Hmm, still stuck at a black a screen with Apple logo and no movement on the progress bar. Do you need any additional info to analyse?

I added -v to boot args, booting stops at: populate_value_from_memory_descriptor:10073: populat

That's right, it did not finish installing because of the forced reboot(after the first step 5 - clever writing step 5 twice though :-( ). Should I wait longer, watching the black screen with Apple logo and progress bar not progressing?

Okay, I did the following: 1. booted Big Sur on external SSD 2. using a 'fresh' downloaded Big Sur Installer and installed Big Sur on internal SSD 3. First reboot: selected 'MacOS Install Disk' in OC BootLoader, install continues 4. Second reboot: selected 'MacOS Install Disk' in OC...