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Probably "Hotel Mode" is on. To turn it off on TV remote need to enter this combination:

Tv will restart and you will see all settings again.

Note: if on top of TV, in bluish background show message "Hotel Pro settings in progress", again enter the same combination. TV will restart again and you won`t see this message but all settings.

Need to go to "Settings" → "Safety and restrictions" and near "Unknown sources" choose "On".

a. To stop application click on TV remote “170” number combination

b. On Tv remote click "Home" button

c. Scroll down to "Settings" section and click on "Settings"

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d. In TV section find icon "Apps" 

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e. Wait while Downloaded apps will be loaded. Find Stream on Screen app and click on it.  

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f. Choose "Clear Data" - > "OK" 

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g. Click on Tv remote "Home" button, find "Stream on screen" app and click on it 

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h. Enter PIN code 

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