thanks. howeve, i get the error message this app is not compatible with your acer a500?Welcome to the forum!
Check this thread: How can i get ICS? as it is pretty much the same thing. I think you need the Acer app (listed in post 5).
Are you sure it's the A500, or possibly the A501? The latter is the model that can access 3G mobile networks if you get it from a wireless company, but is also available elsewhere, like on Amazon. I know that the A501 is NOT being updated to Ice Cream Sandwich, but it still should have been updated to Android 3.2.