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https://us.en.kb.sony.com/app/answer...-an-android-tv.

How to reset an Android TV.
Follow the steps below to reset an Android™ TV.

Using the supplied remote, press and hold the power button until Power off appears on the TV screen. (Approximately 5 seconds)
TV will turn off.
After one minute, turn the TV on.
NOTE: If you unplug and plug in power cable, it may have same effect as the reset steps above.