My tablet has the same greyed out debugging mode issue and also I can't even charge when I connect it to my pc with usb cable. With my charger same cable works. And nomatter if it is connected or not usb debugging mode is always grey. Any suggestions?
This is the device:
Brand: General Mobile Tablet
Model Name: e Tab 4
Android Version: 4.2.2
Wed Jan 29 13:55: 13 KST 2014
Build Number: JER09.GMM01.UDA29
"Convictions are more important enemies of truth than lies." F.Nietzsche