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I’m trying to install Windows 11 on a brand new, today assembled computer. I just updated the bios on the Asus Prime B450-plus motherboard, which should support Windows 11.

The installation program starts ok from a usb stick but after entering the product key it just says that this computer doesn’t support Windows 11.

I’ve checked that AMD fTPM switch is enabled and that secure boot setting is Other OS.

How can I find out what’s causing this?

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  • What's the CPU? W11 requires a Zen+ CPU at the least, first-generation Zen isn't accepted.
    – Zac67
    Commented Dec 26, 2021 at 11:54
  • Run WhynotWin11.exe from Git Hub. That will tell you.
    – anon
    Commented Dec 26, 2021 at 11:54
  • The processor is a Ryzen 3600 that also seems to be supported. Can you tell me how to run WhynotWib11 from a bootable usb or similar?
    – Mathias Rönnlund
    Commented Dec 26, 2021 at 12:06
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    WhynotWin11 cannot be ran from a bootable environment on a flash drive, you need a working Windows install, in order to run it. “ secure boot setting is Other OS.” - Why are you selecting this option? Are you dual booting or something?
    – Ramhound
    Commented Dec 26, 2021 at 17:58
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    My suggestion would be to install Windows 10, then run the script I suggested in this answer, to create a Windows 11 ISO and upgrade your installation to Windows 11.
    – Ramhound
    Commented Dec 26, 2021 at 17:59

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