The Steam Deck OLED is just a refresh, both models will still get updates ofc, even if they didn’t its just a PC you can do what you want with it.

Install emudeck, it has an option for installing it in the main menu.

Yes you can return under warranty if its not working properly, like every device.

I would wait for their response though, don’t just send back with no information.

Me with a LCD SD reading this… 😭