Pin isn't available issue but I can't access to the command prompt using RE

[Windows 10]

I have recently encountered this issue when I was trying to fix a BSOD error so at last in msconfig i accidently selected diagnostic startup, and after a restart my pin isn't available . I tried fixing it by opening recovery by shift+ restart , but there in troubleshooting I have only two options :- startup settings and uefi firmware settings . So I can't access to command prompt nor could I reset my pc .Pls help me

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