Greetings and welcome to the forums,
Nvidia and optimus can always be a hit or miss. I see your BIOS is up to date, so luckily we won’t worry about that ( Nvidia doesn’t like out of date BIOS! ). Without knowing exactly how you installed everything, there are generally 3 EndeavourOS wiki tutorials you want to use to get Nvidia/Optimus up and working. You’ve mentioned two of them already, but for future context I’ll briefly link all 3 since I know there’s like a dozen different Nvidia/Optimus/etc wikis to look through so it can get a little confusing at first to know which to use.
- https://discovery.endeavouros.com/nvidia/nvidia-installer/2021/03/
- https://discovery.endeavouros.com/nvidia/nvidia-optional-enhancements-and-troubleshooting/2021/03/
- https://discovery.endeavouros.com/nvidia/optimus-manager-for-nvidia/2021/03/
Now I assume you’ve tried those three and still were unsuccessful?
There is one other post here that is a guide to install Nvidia hybrid graphics that you could try as well: