I installed the macOS Catalina 10.15.7 Security Patch (19H15) today. I can't boot into Bootcamp anymore not even by holding option/alt, in that case only macOS drive pops up.
I've been using windows 10 just fine until this morning when I booted into macOS and then installed the update.
I've never had these kind of issues. I have tried searching for the same problem but I can't find recent answers.
MacBook Pro 15″, macOS 10.15
Now you need a Windows installer, and rebuild the EFI parts necessary to boot Windows. See https://apple.stackexchange.com/questions/308729/recover-bootcamp-efi-folder-fix-boot-entries for reference.
It is good to see the Bootcamp Windows folder. Can you see Windows files in macOS Finder? If yes, run a SMC and NVRAM Reset and try to boot Windows.
We may need to look at the files via Terminal. You should be able to use
cd /Volumes/EFI
ls -lgRat
and post the output. If I get a window, I will apply the same patch to a 2018 Mini that is running Catalina and W10 and check.
Were any other changes applied to this Mac after the update was applied?
The following command
diskutil repairDisk disk0
will rebuild EFI, but only for macOS. EFI parts for Windows need to rebuilt using bcdboot, which ** knows nothing about.
Be aware that this command may erase the EFI partition to rebuild it.
I assume you have good backups of macOS and Windows.
Can you mount the EFI partition and check if there is a Microsoft folder in it?
It should look like this.
Can you post the output of
diskutil list
from macOS Terminal?
Can you check if System Preferences -> Privacy -> Full Disk Access has System Preferences listed?
If you have not rebuilt the Microsoft folder in EFI, it is unlikely to work. You can also store the same in C:. Another option you have is to consider using Winclone to backup the current installation and restore it. Be aware that Winclone is a commercial tool.
Can you install macOS on an external disk (the same version as your internal disk) and boot from it?
Are you able to see Windows files in macOS Finder?
What is the year/model of your Mac (do not post the serial number)?
You may be able to boot from an external USB flash drive which also includes BC drivers to re-install Windows.
Yes, I can still see the Windows files in macOS. I'll try run a SMC and resetting the NVRAM. I'm gonna keep you posted.
The EFI partition seems empty, other than these standard hidden folders
What repairDisk is going to do if verifyDisk outputs that the disk is consistent
I accidentally marked the thread as solved, which isn't true.
Can you unmount disk0s1 and mount it again? Can you post the commands you used for mounting disk0s1?
Cannot boot into Bootcamp in latest Catalina Patch
