Can't install macOS Big Sur. Error message 'Could not create a pre-boot volume for APFS install'. Have tried multiple times. Impacting my use of certain apps now. Please help!
iMac 27″, macOS 10.13
Yeah, 2017 Mac shouldn't need HFS+
Can you install an earlier OS?
Start up from macOS Recovery
To start up from macOS Recovery, turn on your Mac and immediately press and hold one of the following combinations on your keyboard. Command-R is generally recommended, especially if you never installed macOS Sierra 10.12.4 or later… https://support.apple.com/en-us/HT204904#notupdated
Command (⌘)-R
Install the latest macOS that was installed on your Mac.
Option-⌘-R
Upgrade to the latest macOS compatible with your Mac.
Shift-Option-⌘-R
Install the macOS that came with your Mac, or the closest version still available.
Yeah, 2017 Mac shouldn't need HFS+
Can you install an earlier OS?
Start up from macOS Recovery
To start up from macOS Recovery, turn on your Mac and immediately press and hold one of the following combinations on your keyboard. Command-R is generally recommended, especially if you never installed macOS Sierra 10.12.4 or later… https://support.apple.com/en-us/HT204904#notupdated
Command (⌘)-R
Install the latest macOS that was installed on your Mac.
Option-⌘-R
Upgrade to the latest macOS compatible with your Mac.
Shift-Option-⌘-R
Install the macOS that came with your Mac, or the closest version still available.
Hi
Thanks for response.
It's a 2017 iMac (Retina 5k, 27 inch)
Just did a erase of HD and reinstall of Catalina, upload the HD again through Time Machine, then went to try update software to Big Sur and same issue. This was the recommendation from Apple...Back at the start again with the same problem.
What yea iMac is it?
Some older Macs need MacOS Extended Format to start out with & allow the Installer to convert it to APFS.
Big Sur OS Error message 'Could not create a pre-boot volume for APFS install'.
