I feel your pain. I've searched a bit online and found several different methods (not for Acer though) that all go way over my head. I just leave the BIOS to deprecate on its own by now.
As someone who's built his own PCs for years, I've never really bothered with a BIOS update.
Then again, one of the main reasons to update BIOS is to gain support for new CPUs, but I've been using Intel which switches to a new socket or chipset every other generation anyway. I've almost always had to buy a new motherboard alongside a new CPU.