Hyundai T10 Tablet Woes

Taken with flash
Taken without flash

I have a Hyundai T10 Tablet which I bought in July for my Grandparents from Unfortunately I have not been able to get the 3G to work here in Australia. I tried to upgrade as described here. All went fine until the automatic shutdown. Now instead of shutting down my tablet screen is covered in scribbles like a badly tuned TV! see photos attached.