mobile

ok so long story short, was trying to make my battery life a little better, heard that scaling down the screen res would help, downloaded an app that would do that and instead of make it 250 ppi, i made it 25000 ppi, tablet reset immediately and got stuck on the samsung screen.
tried to fix it with this (http://forum.xda-developers.com/show....php?t=2798835)
no luck, then tried kies and said device wasnt supported.
what can i do guys, need help