hope someone can help. i bought a 2nd hand ipod touch 8gb. the backlight is not working, and i wanted to see if a upgrade or downgrade fixes the no backlight problem. i have tryed everythink restore/dfu mode / reinstalling itunes. tryed diff pc. itunes sees the ipod and in dfu mode i press shift then try to downgrade and keep getting ipod could not be restored unknown error occured ( 20 ) tryed quickpwn with correct firmware however it freezes.