uefi are the modern kinds of BIOS. They are better than older generation BIOS and their more obvious feature is that they have fancy graphics, they don't look like old DOS stuff. Most other things are "better" but from a customer point of view, there isn't a lot to talk about. It supports newer standards like GPT, and other modern stuff that wasn't possible with older generations of BIOS.
As for what you are saying about GPT, afaik UEFI can boot from GPT drives, but work fine with normal (MBT) drives as well. Who said that you need to use only GPT?
According to the product specs here
, your BIOS is uefi already.
In any case, you can do nothing about it, as it's the manufacturer that decides what BIOS each board will have.