Debian 12 Resolution fail with T1000

NVidia T1000 8GB video card installed, mini-DV cable to HDMI 4K monitor

Using the NVIDIA-Linux-x86_64-535.154.05 installer on Debian 12.5. The default install used the Nouveau driver at 3840x2160 resolution but crashes under load.

I installed the NVidia package, and the highest resolution I could get was 1980x1280 (from memory)…
Other than resolution, it ran fine. How do I get the resolution up to the 4K max resolution?

I tried steps that added the lines to xrandr, but the process would not allow the higher resolution to be added.

Any help would be wonderful.