Samsung Galaxy Tab A9
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It's not possible to start my tablet
Solution 6 of 6: The lock code is turned on
The lock code protects the contents of your tablet from unauthorised use (such as pictures and messages). When the lock code is turned on, it needs to be used every time you turn on your tablet and when it has been in sleep mode.
Slide two fingers downwards starting from the top of the screen.
Press the settings icon.
Press Lock screen.
Press Screen lock type.
Press Pattern.
Slide your finger across the screen to connect at least four points and press Continue.
Repeat the selected lock code and press Confirm.
Press the Return key.
Press Screen lock type and key in the current lock code.
Press None.
Press the Home key to return to the home screen.