I had a go at one of these a year or so back
If i can recall there are 2 hidden screws behind the silver plastic strips that run above the side buttons
you will have to damage the strips to get to the screws and then be careful as the ribbon cable connecting the screen to the pcb is very short and delicate
Mine wouldnt connect to the pc to update and was out of warranty so knackering it more didnt matter as i had to purchase a new one
I am not sure i could get on stripped down and put back together without damage to the unit
Hope this helps
Mat