OEM machines are special, in that they special order the motherboards and customize the BIOSs to only take certain models. You will need to contact them for processors that board supports.
I don´t think so. The PC upgrade information for you rig says, that only the A Series is working for a upgrade.
I think the min. Chipset for Ryzen is a B-350 Board.
This MB looks very "basic" (in nice words).