Resolved Best way to return to MacOS from BC

Discussion in 'Mac Pro' started by rawweb, Apr 7, 2018.

  1. rawweb macrumors 6502a


    Aug 7, 2015
    Finally got my hands on a GTX 1080, put my RX 580 back in an eGPU rig. The card is working great in both MacOS and Windows on my 2012 12c. I occasionally boot over to Win to play some Star Wars Battlefront etc.

    Unfortunately, when I originally installed HS it converted my SSD to APFS. So without boot screen I can't easily return to MacOS because BC doesn't understand the APFS drive. I've tried option-boot guessing, and have had no success.

    When my RX 580 was installed, I just reset PRAM to get back to Mac OS. Kind of a lazy workaround. Obviously if I do that now, my web driver switches back to OS default. Easy enough to remote into....

    Just curious if anyone has found a better solution? I'm considering wiping the drive and returning it to HFS for the software boot ability. Is that my best course of action?
  2. Dr. Stealth macrumors 6502a

    Dr. Stealth

    Sep 14, 2004
    SoCal-Surf City USA
    Here's what I do... (Running 2 unflashed 1080 TI's)

    1. Disable SIP

    2. Keep your macOS set as startup drive.

    2. Install BootChamp (free)

    3. Use BootChamp to boot to Windows. (It doesn't change your startup drive, only a one shot boot to Windows)

    4. To get back to macOS from Windows just do a Restart from Windows and it will boot back to your APFS drive.
  3. h9826790 macrumors G4


    Apr 3, 2014
    Hong Kong
    I also agree that "BootChamp + SIP disable" is the best work around.
  4. rawweb thread starter macrumors 6502a


    Aug 7, 2015
    @Dr. Stealth & @h9826790 .. thank you! Feel silly I never knew about that. Works exactly the way I need it to.

    Being as lazy as I feel today, I also didn't want to waste time throwing my old 5770 back in to disable SIP.

    Followed this incase anyone lands on this thread in the future:

    Reboot Mac holding down COMMAND R S

    Wait some time for it to boot to recovery single user mode

    Then hit ENTER a few times to get to the command prompt (I did 6 times for fun)

    To DISABLE SIP: type csrutil disable Wait 10 seconds type reboot

    Once back in macOS you can check the status of SIP with the following command: csrutil status

Share This Page