1. First of all, turn the device off.
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2. Next, hold down the Volume Up key for a while.
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3. Keep holding the Volume Up button! Also, press and hold the Power key for 3 seconds, then release it.
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4. After the tablet screen turns on, you can stop holding the buttons.
5. Cheers! You now should be in the desired mode.
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6. You can navigate this mode by using the Volume buttons and confirm options by holding the Power key.