Panasonic TH-55SF1HU Operating Instructions Manual page 69

Initialization
When both main unit buttons and remote control buttons
are disabled due to the [Button lock], [Controller user
level] and [Controller ID function] settings, set all the
values [Off] so that all the buttons are enabled again.
Press <- (Unit)> together with <RETURN>
and hold for more than 5 seconds.
[Shipping] is displayed and the lock is released when
it disappears.
Shipping
YES
●
Settings for [Button lock], [Controller user level]
and [Controller ID function] will be back to [Off].
NO
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