Bootcamp not booting in Big Sur using Macbook Pro Late 2014

Which macOS version did you upgrade from?

• Does System Preferences have full-disk access to the Bootcamp partition?
• Check if you have a Microsoft directory in the EFI(ESP) partition.

Also, the APFS layer has changed in macOS, which may cause issues AppleControlPanel.exe. As a test, if you have Catalina or Mojave on an external disk

This worked for me but it’s still glitchy to load windows .

1. open terminal
2. Type “diskutil list”

find your windows disk name (for example it may read disk0s2)

3. type in terminal “sudo diskutil mount disk0s2” “sudo diskutil unmount disk0s2”

4.Restart your computer and hold down option.

5.after you put click into boot camp continue to hold down options

6.If it restarts into Mac OS just restart and boot windows and continue to hold down options until windows boots up

Note: windows might try to load up a repair mode but it should let you also load up windows . This will be a slow load up time but after 2 restarts it worked for me. Good luck . Apple will have to provide an update for this bug .

I first tried going into System Preferences - Privacy - Full Disk Accces and granted full disk access to both System Prefrences and Terminal, as others had suggested. I then tried booting into Windows by using the Option key without success. Next, I followed Nero_7's suggested steps of selecting Startup Disk in System Preferences and choosing the Windows partition/drive. I then restarted my 2014 MacBook Pro 15" computer (without using the Option key) and it successfully booted directly into Windows 10 OS on my first try without any issues. I also tried restarting from Windows 10 and it again directly booted back into Windows 10, so Nero_7's solution above worked perfectly for me.

Thanks to everyone for their very useful posts and technical suggestions - hope this solution works for others as well! Cheers!

I am able to boot to windows at startup with the regular procedure as mentioned here before, with the option button pressed at startup which shows selection option windows or mac after 5 - 10 seconds. But the selected settings in Mac to have startup disk booting automatically in Windows does not work. Even found that leave setting for Apple as startupdisk even speeds up the startproces.

Hope that Apple comes with an update and debug!?

Same with me. I've been using windows 10 pro bootcamp via an external SSD for more than two years. Never had any problem. However, I, unfortunately, upgraded to Big Sur and now windows doesn't boot. While holding the option key, it does show both operating systems but when I select window, it processes for a while, screen goes dark for a moment and then display 'no bootable device detected, insert disk and press any key to continue'. More ironic is the fact that I have downgraded to Catalina again but now it doesn't work with Catalina either. Horrific! Have tried all sorts of tricks and tips but nothing seems to work.

I’m back to Catalina and as previously mentioned it will not install Bootcamp after a foray over to BigSur and back again. Strange times. I mentioned that I had tried Parallels which also refused to work. Well I tried it again and this time I was offered an alternative disk to store the Virtual Machine viz Win 10. Not seen this before. Elected to put it on an external disk (in reality the amazing Transcend Jet Drive 128gb SD plugged into the Mac SD slot). It worked with caveats. All a bit slow. Installed Bluestacks which took forever. When I want to close down the VM Mac by quitting the app, MBP won’t play. Pop ups saying I can’t do this because it’s being used. Hard reset sorts it out but it’s not really a great solution. #Parallels

This work for me, push and hold option key while start your mac until start up option show (Mac or EFI boot) select EFI boot and hold option key again till widows logo appear and startup windows finish,

If not success, try again, this made me success to start windows on boot camp.

So, Apple seems to have halted the Big Sur upgrade for some MacBook Pro models. Like I've mid 2014 one and I had to downgrade again to Catalina. Now no software update is available on my Macbook. Probably they have listened to the complaints of update bricking some Mac models, specially the 2013 & 2014 ones.

MBP late 2013 here.

I had the same issue, i tried many of the options there, but i think the one truly working is the keeping the Alt/Option button pressed until Windows finally load.

I don't reboot everyday, so it won't bother me if i had to boot, hopefully it'll be updated soon.

MAK787 wrote:

Probably they have listened to the complaints of update bricking some Mac models, specially the 2013 & 2014 ones.

I can still download macOS Big Sur on a 2012 MBP running Sierra. This was a few minutes ago.

I am surprised that the update is missing from your Software Update. Can you check if you can access the App Store and see Big Sur?

For those who are not seeing Windows partition in Startup disk - be aware that Windows partition must be mounted read-only. That means:

1) Windows partition MUST be mounted.

2) Windows partition must be mounted READ-ONLY. Some utilities like Paragon NTFS for MAC and ntfs-3g mount it read-write which is not suitable for Startup Disk.

MAK787 wrote:

I am actually happy to see this. If they have stopped problematic models from updating, its actually good. Instead of bricking one's mac, its better to wait for more stable release. Yes, I can access app store and by searching, it shows it right there but it doesn't show in system preferences --> software update.

This may be an issue related to Software Update, less so to the availability of the software. If Catalina provides a more stable path, I suggest staying with it, instead of jumping on the Big Sur band-wagon. There are many issues with BS on Intel Macs.

everything is showing up properly once I’m booted into MacOS. All of my issues happen during the boot.

no luck with multiple restarts like others here. Restarted 4 times with Win10 as the default. No luck.

Same issue though. Big Sur caused the OS to disappear. I suppose the solution could be slightly different since I have a T2.

regardless, I’ll start a new thread but do you have any thoughts? This seems to be happening to more people than just the 2014 people. The solutions for those with and without T2 chips may be different even though they’re both having the same issues. Is that worth a second thread?

skaplan151 wrote:

unable to enter my computer. how can I get into my Mac computer???

Are you unable to boot into macOS? Do you also have Windows installed on the same Mac?