Windows 1903 update

Discussion in 'Windows, Linux & Others on the Mac' started by UnMix, Aug 2, 2019.

  1. UnMix macrumors newbie

    Feb 1, 2019
    Is the feature update safe to upgrade to now? It hasn't let me upgrade to it for a while- until now. Just want to check beforehand for issues to be on the safe side and see if anyone else has installed it.
  2. b.lam macrumors member

    Sep 5, 2010
    I have it running on my 5,1 MacPro since May with no issues whatsoever.
  3. Woof Woof macrumors member

    Sep 15, 2004
    Wasn't there a problem if you still have the older 5.1 bootcamp software on the machine? 6.1 works fine for me with 1903.
  4. b.lam macrumors member

    Sep 5, 2010
    I did the update of the bootcamp tools before I upgraded to 1903, so I can't say...
  5. ciyeyiwi macrumors newbie


    Aug 6, 2019
    I have it running on my 5,1 MacPro since May with no issues whatsoever.
  6. Draeconis macrumors 6502a

    May 6, 2008
    I just looked into this myself. Just moved from 1803 to 1809, as Microsoft’s track record for these upgrades isn’t great.

    Performed an upgrade to 1903 on a test system and hit a BSOD on login; WDF Violation.

    If you have an older version of the BootCamp drivers installed that supported Windows 7 (I’m using a MacPro5,1), then the root cause is apparently MacHALDriver.sys located in C:/Windows/system32/drivers.

    This file needs to be moved or renamed for 1903 to run properly, but the side effect is the BootCamp software will stop running, killing your use of the function keys (I have an ACD, so this is important), as well as being able to tell the system to reboot into macOS conveniently.

    If you go here, this chap has developed software to speak to the ACD if you’re just using a PC, so this should be a workaround.
  7. maflynn Moderator


    Staff Member

    May 3, 2009
    Its been on my Thinkpad for sometime and I've not incurred any issues. Its not all unicorns and rainbows, see this thread (the last few pages)
    Windows 10 May update
  8. Draeconis macrumors 6502a

    May 6, 2008
    Just to add, I did wonder whether obtaining a more recent version of the BootCamp WindowsSupport package might contain a newer version of MacHALDriver.sys that supports 1903, and sure enough it does.

    If you have another newer Mac to hand, you can download the WindowsSupport folder by launching Boot Camp Assistant, clicking View and Download Windows Support Software. This contains a newer MacHALDriver.sys, as well as an ini and inf with the same name, which I copied over too for fun.

    If you run into this issue and don’t have a more modern Mac to hand, will happily post this file for others to use.
  9. satcomer macrumors 603


    Feb 19, 2008
    The Finger Lakes Region

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8 August 2, 2019