Hi @»» ♡ 𝒔𝒖𝒏𝒓𝒂𝒊𝒏 ♡ «« ,
Please note that Microsoft Q&A is currently in English language only.
The PC Health Check is correct and unfortunately, i5-6400 CPU processor is not compatible for Windows 11.
You'll find the Microsoft's official Windows 11 list of supported Intel processors over here:
https://learn.microsoft.com/en-us/windows-hardware/design/minimum/supported/windows-11-supported-intel-processors
You may always provide feedback and request your processor to be supported by using the Feedback Hub app:
https://support.microsoft.com/en-us/windows/send-feedback-to-microsoft-with-the-feedback-hub-app-f59187f8-8739-22d6-ba93-f66612949332
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Best regards,
Leon