PS. If you read around the web.

by R. Proffitt Moderator - 2/13/13 7:21 AM

In Reply to: Depends on the model. by R. Proffitt Moderator and many other discussions find that there is no standard here.

Also, if you installed a rooted OS, then it changes again to what's in that OS image (sometimes called firmware.) seems to find folk that solved this. And as I suspected it's never the same solution.