1. My computer works perfectly in Normal Mode.
  2. When I try to boot into Safe Mode, I am greeted with BSOD and the stop code "UNSUPPORTED_PROCESSOR". The computer then reboots itself into Normal Mode again.

The processor is an Intel i7-8700K. How do I start debugging this? I would like to boot into Safe Mode to delete some drivers that are always in use in Normal Mode.

  • You start by advising the model of processor. This strikes me as being a driver related issue. Why would you want to remove in-use drivers? If you really want to risk stuffing up your - apparently already fragile - sustem, you could try doing thus operation in Linux.
    – davidgo
    Jun 6 '20 at 6:13
  • Updated to add the processor model. Although I added the specific reason that I currently want to boot into Safe Mode, I'm sure other reasons will arise in the future. So I'm really looking for help resolving the inability to boot into Safe Mode.
    – Tag
    Jun 6 '20 at 7:44
  • That is a curious bugcheck code - docs.microsoft.com/en-us/windows-hardware/drivers/debugger/… does a minidump file get created even? I.e. under \windows\minidump\. If so can you link it? Jun 6 '20 at 8:44
  • Right? There's no way Windows 10 doesn't support an 8th gen i7. No crashdumps or minidumps unfortunately :(
    – Tag
    Jun 6 '20 at 8:49
  • I would back up your data and do a clean reinstall of 1909, see if still does it.
    – Moab
    Jun 6 '20 at 12:36

Updating my BIOS fixed this for me. In my case Safe Boot was not working with ASRock Z370 Killer SLI/ac BIOS version 3.30, but it does work with version 4.30. I know that Windows uses a newer version of microcode for the i7-8700K than the BIOS version 3.30 that I was using. Perhaps Normal Mode is able to handle an older microcode from the BIOS where Safe Mode is not 🤷‍♂️

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