Try this,,,settings>storage>apps> demo video> disable
or this,'
Tap on Apps in home screen - Settings - Storage - Internal Storage - Apps - Scroll down and Identify "Demo Video Application" under the apps list .
Tap on Clear Cache and tab on "Disable", Ignore the warning message.
Note: Cust may see the "Demo mode" icon in the homescreen, however it wont bringup Demo Video
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