I received the T830XXU4BTB2/T8300XM4BTB2 1ST MARCH security patch today and scheduled the install - it did not go well when I went back to it this evening.

Half of the screen is now black and white hatched lines. I can access the whole screen -half at a time by rotating the device. I have not dropped or otherwise damaged the tablet.

I did a factory reset -but this has not helped. Any ideas, it is still under guarantee from John Lewis.