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:
You may always provide feedback and request your processor to be supported by using the Feedback Hub app:
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accept as answer, thank you!