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#51
Your computer BIOS can be set to operate as Legacy or UEFI. No doubt that it was installed as Legacy
Open device manager. Is there any yellow alerts of missing drivers?
You can only downgrade to Windows 10 within 10 days of upgrading to Win 11.
If the upgrade to Windows 11 was performed more than 10 days ago, the only option is a complete reinstall of the OS from a Media Creation Device (USB).
To see if you are eligible for a downgrade:
1. Open Settings app on your Windows 11, go to System > Recovery. Under Recovery options, click Go back.
2. Select a reason for downgrading.
3. Make sure you remember your password and proceed through the prompts.