Bios Mods -The Best BIOS Update and Modification Source

I found a Lenovo ThinkCentre M700 SFF (Model 10GS) at a thrift store, and was considering upgrading it to turn it into a budget gaming machine. I've already put in a request to add Kaby Lake support (it's H110 chipset with Skylake only at the moment) but it seems I'd need a hardware programmer to do so. With that in mind, it might not be worth the effort. However, I'm still curious if there is a whitelist for wifi and potentially even for GPUs as well. It didn't come with a wifi module, though I know other models in this product line definitely did. I read somewhere online that Lenovo may have only supported certain GPUs on this model, regardless of whether or not the GPU fits physically and is within the power requirement. If this is true, then turning this into a gaming machine is hopeless. So I'm hoping someone can take a look and tell me if a whitelist exists, and if so, what parts are supported and how easily the list can be changed.

Here's the information I have:

Lenovo ThinkCentre M700 Spec Sheet
Latest BIOS
Photos of CPUZ and Motherboard


Thanks in advance!