Bios Mods -The Best BIOS Update and Modification Source

I want to use 2 32gb sticks of ram in an elitedesk 800 g2 Tiny. What processor do I need to buy? I think it's a 1151 I'm not sure. What is the bios for me to install with a link please.

Is it possible to use 2 64gb sodimm ram? I am using ddr4 3200 sodimm that can downclock 32gb each

It's the smallest model

Show a screenshot of CPU-Z: CPU & Mainboard tabs.

I think all the motherboards are the same. It's the smallest model with an i5 sticker that I don't have. I read 6500T is one of the faster processors you can put in it. There's an i7 upgrade as well. The processor installed when manufactured contains the GPU 530 graphics.

No screenshots - no help.
Come back when you will have this system.