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2013-11-12 05:40 PM
I am not informed about the Xperia Z tablet,but you could try that code provided in the upper posts,maybe it will work.
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2014-01-20 09:59 AM
I am also facing the same problem and also tried all the codes mentioned in this whole disucssion, but not able to get rid of this demo video. Please provide me some valid solution how to get rid of this video. I found that there is a retail demo app that runs on back which start this video. But ther is no option to unistall this app. So can you provide me the solution to unistall this application.