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Reload this Page dual-booting Windows no longer works properly after Fall Creators Windows 10Update
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Old 01-26-2018, 05:00 PM   #31
jamie marchant
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Not since I did the Fall Creators Update. When I disconnect the drives, I disconnect the power connectors, so everything stays in the same place. You are correct I have no EFI partition so my configuration is "legacy" whether I support EFI or not.

UPDATE: I did set my BIOS setting to default to try and fix this issue but as I believe I said there is no "legacy or EFI" switch.
Last edited by jamie marchant; 01-26-2018 at 05:08 PM.
 
Old 01-26-2018, 05:24 PM   #32
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Quote:
Boot only when in UEFI mode: Remove the bootmgr file from the root of the Windows PE or Windows Setup media. This prevents the device from starting in BIOS mode.

Boot only when in BIOS mode: Remove the efi folder from the root of the Windows PE or Windows Setup media. This prevents the device from starting in UEFI mode.
The quote above is from this page regarding install media, not necessarily applies to an installed system, but maybe it's the same for installed system, this needs to be investigated more.
 
Old 01-26-2018, 05:28 PM   #33
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If I'm reading it correctly, the bootmgfw.efi is required for Bios mode, but not the bootx64.efi. But that's just a guess, needs investigating.
 
Old 01-26-2018, 05:34 PM   #34
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I booted my old desktop to Windows 7, the boot file in root/C drive is "bootmgr", in the Boot folder is "bootmgr.exe.mui"

I'm thinking, the fw in bootmgfw.efi refers to firmware, which is what UEFI is.
Last edited by Brains; 01-26-2018 at 05:39 PM.
 
Old 01-26-2018, 05:34 PM   #35
jamie marchant
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Hmm, I have both, if we could confirm that I don't need one then I would be willing to make the other unavailable to the OS.
 
Old 01-26-2018, 05:51 PM   #36
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Quote:
On BIOS/MBR-based systems, the default value is BIOS. This option creates the \Boot directory on the system partition and copies all required boot-environment files to this directory.

On UEFI/GPT-based systems, the default value is UEFI. This option creates the \Efi\Microsoft\Boot directory and copies all required boot-environment files to this directory.
The quote above is from this page. A little reading required, found near middle. I'll keep reading./f <firmware type>
 
Old 01-26-2018, 06:00 PM   #37
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Starting to look like the EFI folder is confusing grub, but I would read that page carefully as using bcdboot will ensure PBR is proper for grub. (Partition boot record)
 
Old 01-26-2018, 06:24 PM   #38
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This one surprised me:
Some older PCs (Windows 7-era or earlier) support UEFI
From the page I linked in post 32
 
Old 01-26-2018, 06:59 PM   #39
jamie marchant
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I renamed the EFI to "not-EFI", this caused "bootrec /RebuildBcd" to complete successfully. Now "bootrec /fixboot" returns "access denied". "bootrec" is one of the programs on the official Windows 10 recovery disk.

Also, all x86(and x86_64) Macs use UEFI but they have a custom mode simalier to "legacy" mode that allows them to run systems such as Windows XP that don't support UEFI. Other machines may have done something similar. The first x86 Mac came out in 2006.
Last edited by jamie marchant; 01-26-2018 at 07:07 PM.
 
Old 01-26-2018, 07:38 PM   #40
jamie marchant
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Ok, somehow that clobbered the partition table on the drive.
 
Old 01-26-2018, 07:44 PM   #41
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So....
Still not booting with grub?
 
Old 01-26-2018, 07:55 PM   #42
jamie marchant
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Nope, I have to load my image I took before installing the Fall Craters Update. Make sure the image is stable and then try again.
 
Old 01-26-2018, 08:01 PM   #43
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I was under the impression bootrec was frowned upon after Windows 7, bcdboot is recommended.
Might be worth trying that first since it's not bootable anyway.
Good thing you have a backup

EDIT: Disregard, does not work on MBR or PBR
Last edited by Brains; 01-26-2018 at 08:04 PM.
 
Old 01-27-2018, 10:01 AM   #44
jamie marchant
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I spent a few hours last night trying and failing to restore the image, it was not as simple as I would have hoped. Well, I will need the working Linux system for some projects today and next week and don't have time to spend longer at this now. I hardly use the Windows installation and have another computer with Windows that I can use for work. I will let you know how things progress when I pursue this again.
 
Old 01-27-2018, 10:17 PM   #45
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I wonder if that Windoze update included some microcode updates for Meltdown and friends. There have been reports of systems getting bricked.
If so, restoring backup images (either Linux or Win) will have no effect.

I have different systems including one where Win10 boots off MBR and Linux off gpt (UEFI), but no BIOS based systems that show symptoms like this.
I rarely boot to Win, but they won't be getting any updates any time soon.
 
  


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