"Demo Purpose Only" ... Please Help !

[Superior]

Hi all you guys !...

I just got this 7" Android Tablet from eBay with the following info:

Model name: MID (M 70003)
the following is from the settings section "About Device":
Firmware Version: 1.6
Kernel version: 2.6.29-00236-g4f8dbbb-dirty ... (??!)
Build number: 1.7.2

The device seems to work ok but the thing is that it displays on the top left screen's corner in red color the phrase "Demo Purpose Only" ... (which drives me mad since it's in all screens ! ... everywhere, always on, no matter what screen I look at !) and I really need to get rid of it).

Does anyone know how can I do that ? ... i.e. could I flash again Android's previous version 1.5 (instead of the 1.7 it now has in) as it looks like something is going on with its "licenses validation", will this solve the problem or is there another much easier way ? Could I also upgrade to the latest Android versions beyond 2.0 ?

Many thanks in advance you guys !

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