I recently updated my tablet from ICS to a jelly bean version the problem there was no touch screen i tried to inject touch screen drivers in the tablet then the tablet restarted and stuck at the boot logo now it wont detect the Usb cable or go in CWM it just power on and stays on,i've read topics about shorting certain contacts that can bring the tablet alive, but i dont know which contacts that do that i have an Allwinner A13 tablet HYNIX nandroid chip Model HU7UBG828TR ive downloaded the techinical specification but i couldnt understand wot contacts to be shorted, i have backed up Rom and a micro SD what can i do please help.

