Windows 11 Upgrade Stuck on Restart – Safe to Force Shutdown?

I recently attempted to upgrade a client system from Windows 10 to Windows 11. The upgrade process seemed to go smoothly until the final stage – it’s been stuck on the “Restarting” screen for over 10 hours. I even left it overnight, but there’s been no change.

Has anyone encountered a similar issue where the system freezes at restart during upgrade?

Here’s what I’d like to know:

Is it safe to force shutdown the system at this point?

Could this be due to hardware compatibility or missing drivers?

Would using Windows 11 Installation Media be a better route?

Any experiences or workarounds would be greatly appreciated.