I had this same problem. This BIOS update is deeply flawed and needs to be removed and redone. I can only imagine that more people haven't had this problem because they don't bother to go look for Acer updates online since there are basically none available.
I tried many solutions and am a tech professional. Ultimately a windows restore and reinstalling my touchpad driver fixed it. It was a really ugly experience and turned me off from acer. You should see screenshots of the broken English in BIOS. I don't have the energy to take and post them.