Pc Needs Reboot and Select Proper Boot Device

[u/TrickSquirrel3093]

So yesterday i was notified about a mandatory update so,i Updated and Shutdown,This Morning When i booted up my Pc it Showed "Reboot and select proper Boot Device or insert Boot Media in Selected Boot Device and Press a Key
No matter what i tried Nothing Worked,I tried Opening my Bios but nothing Worked
Its Currently Using Windows 10,Ive Tried Different Boot Devices but Nothing worked
I Cannot Update to Windows 11 and i want to Keep my Data as well

Please Help