acer veriton m275 bios mod

hi to all i need some help on unlocking my acer veriton m275 bios, i need to over clock my proci a little bit and my ram has a limit for only 4g and i want to buy some extra memory so i cant play decent lan games like BOF4 and COD ghost, your help will much appreciated thank you and GOD bless

here is the link for my bios update :http://global-download.acer.com/GDFi...CER&SC=EMEA_25