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Has anyone used brigadier to get a more recent Mac's bootcamp installer and extract whatever bits allow APFS volumes to show up in the startup disk selector in the bootcamp control panel under windows? If so what specifically did you have to do?

Details:

Have a late 2012 MacPro. It dual boots Mac OS X Mojave and Windows 10. In order to run Mojave the video card had to be upgraded. The Sapphire RX580 pulse is acknowledged by Apple as a working "metal" card and seemed to be popular so I went with it. The problem is it doesn't support boot screens. Not a huge issue until you want reboot from Windows back into Mac OS X on Mojave. Since Mojave automatically converts the install target to APFS there is no way to do it now short of zapping the PRAM or booting recovery and changing the startup disk that way. The lack of boot screens means no startup menu support when holding the option key.

I've done a lot of digging and I understand that newer Macs using bootcamp alongside APFS correctly show the OS X disk as a startup disk in the bootcamp control panel under windows. That is how I ended up with the question above- wondering if anyone has taken the time to figure out what drivers or what specific components in the bootcamp ESD for those macs changed and allowed APFS to work correctly with regards to the "Restart in OS X" bootcamp option under windows.

  • I found this - waaaay too much to even try to précis into an answer. I have a flashed 7950 which can see the boot screen, so I've never tried this. forums.macrumors.com/threads/… – Tetsujin May 16 at 7:14
  • Thanks tetsujin, that looks like exactly the same idea and a solution to the specific question I asked. I think I'm going to give the rEFInd solution a try first before going to far down this road with making a new bootcamp install on an older mac. – jptros May 16 at 10:40
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Trying to get a "more recent Mac's bootcamp installer" is the wrong approach to take in a effort to solve your problem. Especially, since there are other ways to solve your problem which involve using the rEFInd Boot Manager. This free software is capable of instructing the firmware to boot Mojave.

One solution involves creating a small 300 MB "Mac OS Extended (Journaled)" volume where rEFInd is installed. Here, rEFInd is configured to appear as a legacy OS X operating system. The Boot Camp software installed in your Windows operation system will detected this volume as OS X. When booting from this volume, rEFInd will automatically instruct the firmware to reboot to Mojave. This is setup to happen silently.

Note: The rEFInd Startup Manager executes silently and therefore does not require user input.

An example of how to setup rEFInd as described is given as the accepted answer to the question: macOS partition disappered after installing windows 10 using bootcamp.

  • Thank you. I did look at using rEFInd but at some point I dismissed it because I came to the conclusion that it would have the same issue as the option boot menu, no video output so not usable. I was looking back through the docs to try to find it again, but this along with the provided rEFInd question looks promising. I will give it a shot. – jptros May 16 at 10:32
  • I had time to give this a go today. Followed the instructions from the linked question, works as expected. I'm able to boot between OS X and Windows using their respective startup volume selectors. Thanks again for pointing me in that direction. – jptros May 17 at 17:27

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