My RTX 3050 works fine passed through to Windows and Linux standalone HVMs without any special firmware tricks or other things. You need to provide more detailed information for people to be able to help you. The most important question is, if this is a laptop or a desktop. With laptops you will generally have more issues. If you’re on a desktop, Create a Gaming HVM should give you the details needed. Though, if you’re on 4.3 version, I would use the settings menu to attach devices instead of qvm-pci because the device names have become too long for my taste and the settings seem to work fine for this purpose. To find the addresses for hiding at boot lspci works well.