System froze on update. Can only boot into a btrfs snapshot. Update there not working

The stem of your problem is nvidia 550.xx drivers.

Device-2: NVIDIA AD104M [GeForce RTX 4080 Max-Q / Mobile] vendor: Dell
    driver: nvidia v: 550.76 arch: Lovelace pcie: speed: 5 GT/s lanes: 8 ports:
    active: none off: DP-3 empty: DP-1, DP-2, HDMI-A-1, eDP-1 bus-ID: 01:00.0
    chip-ID: 10de:27e0

This is a continuous problem (it’s not us it’s them). Try the solutions listed here.