Windows 11 won't come up after reboot

[Microsoft Windows]

On an HP360 Envy laptop, Windows 11, asked to reboot to install update, windows would not come back up. Got Bitlocker screen, entered key and tried system repair, no luck. went through troubleshooting steps, won't roll back updates, wont even boot from my system repair USB, just keeps returning to Bitlocker screen. Don't want to lose all my apps and files. Must I wipe and reininstall, ? any options? Why did this happen?

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