Bootcamp not booting in Big Sur using Macbook Pro Late 2014

Try reinstalling the partition and if you have issues creating the partition, follow these steps. Had this issue myself and this fixed it.

This is the fix:

First run First Aid on the whole of the HDD/SSD

Then restart the Mac setting it to not open any services other than the base OS

Then only open the Boot Camp Assistant

(This will fail if you open anything even if it is as simple as OneDrive auto sync or Disk Utility)

This should work

Hi there,

I had the same issue and I just solved it by allowing the Terminal app access to the discs. Just that looked to be sufficient to boot from the bootcamp partition in the old traditional way of pressing the option key during startup

sbisas wrote:

I had the same issue and I just solved it by allowing the Terminal app access to the discs. Just that looked to be sufficient to boot from the bootcamp partition in the old traditional way of pressing the option key during startup

There are many variants to the same problem. Missing EFI information for one, not being able to bless a legacy BIOS installation, EFI vs BIOS boot and various models. Third-party NTFS drivers also interfere with booting.

Do you have a 2014 Mac?

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!

Similar issue. MBP late 2013. Removed Bootcamp to make space for Big Sur install. Tried to restore through BCA. It all seemed to go well and Win 10 went through its paces. However it never actually installed. No boot into Win option on restart and the Bootcamp icon on the Desktop was empty. Have tried it twice but no luck. Reverted to Catalina.

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!?

I've this issue too. Try to solve as the replies suggested, nothing can help me. Pressing "Option" key and change the startup disk returned to MACOS, after changing startup disk, pressed and hold the "Option" key until Windows finish booting.

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.

So, one of the trick has worked for me.

Open System Preferences > Startup Disk > Choose Windows Boot Camp as Boot drive and restart your mac. It boots into windows OS directly.

Though I had already downgraded back to Catalina but still it doesn't boot into windows in an external SSD. Hope they fix the issue soon.

Same deal exactly. Had it lost it and now don’t have it. I even tried Parallels 16 trial and that actually installed and booted into Windows. However as soon as I tried an internet search on Win 10 it threw a wobbly and went into a play suspended loop. I think Big Sur is leaving a little bit of itself on the MAC HDD. I’m trying again with a brand new .iso Win10_20H2. I’ll let you know!

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.

I have the same problem on the same model. Allowing application full access to the this doesn't make any difference and only the now Macbook models boot Windows using EFI the old ones like mine use standard BIOS.

After some auto reboots mine show a folder with question mark and the url support.apple.com/startup

Also I am having problem using my Window 10 VM in VMWare Fusion it is extremely slow impossible to use now on Big Sur, even disabling a feature to prevent meldown and spectre.

That's unfortunate. I already had complex configuration (I have sort of portable windows drive) but somehow it has worked for me. Before upgrading to Big Sur, I had to bootin into windows portable ssd using an option button and it never faultered. However, after upgrade, pressing the option button did show both operating systems but when I clicked windows 10, it would process for few moments and instead of loggin in, it would say no bootable device..... I then downgraded to Catalina (Fresh installaion) and now it too had same problem. Then I logged into mac (Catalina), connected my SSD to mac via USB and ensured that it was visible in finder. Then went to preferences and chose the sytsem to boot into windows after next restart. This worked. I tried the same trick while in Big Sur and it didn't work. Strange but this is what is happeing.