Hello, thank you for reaching out to Microsoft Q&A.
Could you please provide the exact error message that appears on the Windows sign-in screen? Also, do you see options to change your sign-in method - for example, switching between Windows Hello PIN, password, biometric (fingerprint), or facial recognition?
If you have made any security changes to your device, such as updating BIOS or Windows, and you are asked to set up a new PIN or trying to reset it, you will need to verify your identity using recovery contact methods like your phone number or email address.
If you no longer have access to any of these recovery options, you will need to update your security information. On the verify your identity screen, select "I don't have any of these" and follow the prompts to update your security details.
Note - If you remove all of your previous security information and replace it with something new your account will be put into a restricted state for 30 days.
So, you will be able to reset your PIN only after your security information is updated.
If you would like to use your device now, you will have to fully factory reset your computer which will completely wipe all the data in your HDD. And set up your device with another Microsoft account.