I had this same problem on my M003 build 1.7.2. The message disappeared shortly after I flashed it to 1.7.4 and I've never seen it since. Could also try a firmware update then a factory reset from the settings menu.
Updated to slatedroid custom firmware, and now there is a big message in the middle of the screen that says Demo Version has expired. I have tried factory reset and that doesn't do anything. The only way to remove the big message is to go bk to the original firmware. Then the Demo Purposes only message comes bk
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