GNU/Linux Debian Bookworm Installing NVIDIA GeForce GTX 1080/Ti Driver Guide
How to Install NVIDIA GeForce GTX 1080/Ti Graphics Driver on Debian Bookworm 12.x Desktop – Step by step Tutorial.
The NVIDIA GTX 1080/Ti Debian 12 Driver Setup is Simple and involves just the execution of a few Basic Shell Commands.
Especially relevant: currently the NVIDIA 535+ Driver is not available in the Debian 12 Repos.
So here I propose as an available Solution the latest Generic Linux Driver build from NVIDIA.
Again in case of Installation Issue you should priorly see the Upgrade Kernel Guide.

GNU/Linux Debian 12 GeForce GTX 1080/Ti Driver Installation Guide