Samsung UN65D8000XFXZA - Manual (Page 204)

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2. Enter the your security password.
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The default password set is “0-0-0-0.”
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If you forget the password you created, press the following sequence of
remote control buttons to reset the password to “0-0-0-0”:
POWER (off) → MUTE → 8 → 2 → 4 → POWER (on).
3. After a few moments, Smart Hub automatically resets. The screen may
go black, then Smart Hub re-appears. In a few moments, it starts the re-
initialization procedure.
4. To complete the re-initialization, go to Step 2 in Starting Smart Hub for the First
Time.