BIOS update made my windows not be activated anymore

A BIOS update can cause Windows to see the device as changed hardware, which can break activation because the license is tied to the device hardware.

For Windows 10, try these steps:

1. Open Start > Settings > Update & Security > Activation.
2. If Troubleshoot is available, run it. This option is available only when Windows isn’t activated, and an internet connection is required.
3. If the troubleshooter shows the option to reactivate after a hardware change, use that path.
4. If there is a Change product key option and there is a valid 25-character product key, enter it there.
5. Check that the installed edition matches the license. In Settings > Update & Security > Activation, confirm whether the PC is running the same edition the license is for, such as Windows 10 Home or Windows 10 Pro. If the edition does not match, Windows will not activate.

Important detail for a motherboard change:

• If Windows was preinstalled by the PC manufacturer (OEM) and the motherboard was replaced, the documentation states that a new license is required after a change such as replacing the motherboard.
• If the motherboard was replaced by the original hardware manufacturer, the PC should reactivate automatically. If it does not, use the product key from the COA card if one was provided.

If none of the above works, contact Microsoft customer support for activation help.

• Activate Windows
• Using the Windows Activation troubleshooter
• Fix Windows 10 activation error 0x803F7001