Unsupported CPU KB ID 0001878

Problem

I needed to upgrade a Windows 11 VM from 21H2 to 23H2, as is recommended I installed the PC Health Check, I was surprised to see this error.

The processor isn’t currently supported for Windows 11.
More about supported CPUs
Processor Intel Xeon CPU E5-2650 v3 @ 2.4GHz

I say surprised, because although this was a VMware virtual machine it was ultimately on a HPE DL360 Gen 9 – which is getting on, but is in no way ancient.

Solution : Windows 11 Unsupported CPU

I’ve written before about to how to bypass the lack of a TPM, but you can also get Windows 11 to bypass the processor check also.

Launch the registry editor (regedit) and navigate to the following location

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HKEY_LOCAL_MACHINE > SYSTEM > Setup > MoSetup

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Note: On my 21H2 VM the MoSetup Key did not exist, so I had to create that key first!

Create a new 32 bit DWORD value called AllowUpgradesWithUnsupportedTPMOrCPU and set it value to 1 (one).

You should now be able to perform the upgrade without error.

Start and end results of winver prove the upgrade was then successful.

Related Articles, References, Credits, or External Links

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