…And yet you failed to provide a single bug report file or even a single line from logs…
Have you even bothered to read the wiki:
Currently no Debian-packaged version supports Blackwell GPUs (for example RTX 50xx series).
It’s virtually impossible to help you given how little information you provided, but my totally wild guess based on the meta information that you didn’t bother to ready ANY proper documentation (just some random posts about random boot options) and that you did not reassured that you were trying the open flavor, is that you were using the proprietary one, which does not support Blackwell. Also further evidenced by the fact that 1030 worked fine.