i also have acer comp.cant oc but can tight the ram timing.i also use ctrl+f1,ztrl shift f1,alt shift f2 also didnt work.even ratio dun have.

my acer is aspire 7600g but looking at the mobo is made by msi.searching the model n it oem brand cause dont have the model at their website(msi).u can try msg acer to have new bios with unlock feature if they willing to.

change mobo.that what i do with my acer rig.