How unbrick Samsing Galaxy Tab 10.1 P7500, only APX ?

I have the friend's P7500, display is blac, the tablet does not react to PowerOn (over 20s) or PowerOn + Volume Up.
When connected to a PC is found as APX.

On internet I found
http://forum.gsmhosting.com/vbb/f705...7100v-1390561/
but all link is dead

You advise how to do it?
How unbrick P7500?
Where to download APX NVidia Fladsh USB Driver and NVida Flash utiliti and recovery boot image for P9500?
Of course, welcome a detailed step by step instructions
I thank everyone in advance.