BIOS V1.13 of Acer Aspire V3-571G doesn't have UEFI settings?

Hello everyone, thanks for visiting. So I have bought this Acer laptop for 1 year, and it's BIOS came with V1.0 didn't have UEFI setting, the default is LEGACY. After trying updating that BIOS version to V1.13 successfully, I still don't see the UEFI setting, when I check in a software called HWiNFO64 Program, it says my laptop BIOS is capable of UEFI BIOS. So my main questions are....How can I have UEFI setting in my BIOS? What should I do?

My specs: Intel Core i7-3630QM 2.4GHz, Nvidia Geforce GT 640M 2GB, RAM 8GB, HDD 750GB, Windows 7 Ultimate SP1 x64 (Will upgrade to Windows 8.1 Pro x64 if I can change my BIOS to UEFI boot).