Go to the manufacturer’s support page (ASUS, MSI, ASRock, etc.).
Your PC may restart several times. Do not turn off the power during this process. Troubleshooting Common Issues
Go to the support site for Dell, HP, or Lenovo and enter your Service Tag or Serial Number.
If your power cuts during the update, check if your motherboard has a "BIOS Flashback" button on the rear I/O to recover the system.