GNU/Linux Debian Trixie Installing NVIDIA GeForce RTX 4070/Ti Driver Guide
How to Install NVIDIA GeForce RTX 4070/Ti Graphics and GPU Driver on Debian Trixie 13.x Desktop – Step by step Tutorial.
The NVIDIA RTX 4070/Ti Debian 13 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 13 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 13 GeForce RTX 4070/Ti Driver Installation Guide