Unbootable PRESTIGIO MULTIPAD 4 DIAMOND PMT7177-3G tablet diagnosis(my child device) : When power off : a) charging; b) accessing recovery menu, three ways appear on the screen: recovery mode, fast boot, normal boot. Choosing first, freeze on doing anything, choosing the other two it stuck on boot screen. When power on : a) freeze on boot screen; b) after connecting to a desktop/laptop with a various number of usb cable, freeze on boot screen and constantly connecting and disconnecting. The usb ports from desktop/laptop are ok(I’ve tried to connect the my phone in all usb ports of pc whith all usb cable that I have and everything is ok). In device manager the tablet is detected for a second, after that disappear because is connecting / disconnecting over and over again from PC. It simply can’t stay connected. I tried to disable the usb settings from power option plan, but nothing happened. My first concern is to connect the tablet to a desktop/laptop+flashing firmware. Any suggestions/tutorial on how to do it, will be highly appreciate. Tks.