I am having issues with my n7 usb port or prolly the battery. my n7 is unable to charge or detect any PC/OTG usb devices when it is on. It is able to charge when powered off. the battery now depletes abit faster.
This program will restore everything back to stock for you: http://forum.xda-developers.com/show....php?t=2389107
Though you may struggle to get it relocked with a faulty USB port
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