- May 29, 2013
- Gigabyte Z390 M Gaming
- i9-9900K OC'd @ 5.0GHz
- Vega 56 (Bios flashed to 64)
- Classic Mac
- Mobile Phone
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 myself that "maybe it has to do with the Clover update".
So I started a bold Big Sur update instead...and it worked!!
I have the same problem.I installed Big Sur in an external ssd disk and I can’t choose this disk as bootable , I get the same error.any way to fix it?
Because I can’t set the external ssd as bootable I haven’t finished the installation.Installer promted me to restart my iMac but I can’t set it as startup disk to finish it.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, but relating to your scenario with external drive: as I was unsure on behaviour I started the clean installation process with a functional EFI config on an otherwise empty external drive (an M.2 970 card). After successfull Big Sur installation process on that drive I then used migration tool to transfer my user content from the working Mojave install to Big Sur drive. After verifying that everything was OK, I swapped the internally installed M.2 card with the external one.
In essence: I don't think that the fact that you are installing to an external drive is a factor in the error message your are seeing.
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...Because I can’t set the external ssd as bootable I haven’t finished the installation.Installer promted me to restart my iMac but I can’t set it as startup disk to finish it.
I boot with the default hdd disk which bug Sur is installed but I want a fresh install to my ssd in order to swap it as my main bootable drive.
can mitigation help me ?