Can't enable secure boot (Windows 10, HP Compaq Elite 8300 SFF)

[Somebody4545]

When I attempt to enable secure boot, I get a message like "No device to boot to". Is there any way I can enable secure boot and launch Windows 10? I was planning on enabling it to run Windows 11. 

EDIT:
8th gen <= intel core processor required

TPM 2.0 Required

They removed the soft floor, honestly might as well switch to linux and keep windows 10 for games if I can't upgrade before 2025. 

Really hope they add it back, but honestly, Windows 11 is probably a gimmick to get people to buy new hardware instead of using what already works

[Somebody4545]

I also do not have any Windows 10 drivers from HP to install either

[Paul_Tikkanen · Accepted solution]

Hi:

You can't enable secure boot without disabling Legacy mode, and you can't disable legacy mode unless you reinstall W10 in EFI mode.

When you disabled legacy mode, the PC can't boot from the hard drive because legacy mode uses a MBR boot structure and EFI with secure boot uses a GPT boot structure.

I would not be too concerned at this time regarding the W11 compatibility tool.

Take a look at this document...as long as your PC meets the Hard Floor requirements, you may be able to upgrade to W11.

Compatibility for Windows 11- Compatibility Cookbook | Microsoft Docs

PS:  I noticed that Microsoft edited the above article and removed this information that it used to contain.

Hard Floor:

• CPU: Core >= 2 and Speed >= 1 GHz
• System Memory: TotalPhysicalRam >= 4 GB
• Storage: 64 GB
• Security: TPM Version >= 1.2 and SecureBootCapable = True
• Smode: Smode is false, or Smode is true and C_ossku in (0x65, 0x64, 0x63, 0x6D, 0x6F, 0x73, 0x74, 0x71)

Soft Floor:

• Security: TPMVersion >= 2.0
• CPU Generation

[Somebody4545]

Thanks for the info, good to know there is a solution. I will probably end up reinstalling windows if that ends up being an issue

[Paul_Tikkanen]

You're very welcome.

All you need to do is to install W10 from one of the bootable EFI devices that you will see listed in the F9 boot options menu.

There should be an EFI DVD and EFI USB flash drive.

Don't enable secure boot until after you reinstall W10 in EFI mode, or there is a good chance no bootable EFI device will show up but the Windows boot manager.

I installed W10 in EFI mode using a DVD and a USB flash drive in a HP Pro 6200 MT and a couple of Dell Optiplex's.