My brother bought this tablet a few days ago but has now had a problem of black screen at startup so I tried to reflash it with a new ROM. None of those tested worked, it crashes all on "erase file system failed! exit!" I made several attempts but at some point the update process was abruptly interrupted, and from that moment it stop working. Let me explain, by holding down the power switch the green LED turns on but nothing appears on the screen, even if I insert a memory with a new rom . Does anyone have any idea?