Toshiba 58L5400UC, 65L5400UC Switching between two channels using SurfLock

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Setting up your TV
If you press the CH RTN button from a non-antenna input, the TV will
return to the last-viewed input.
Switching between two channels using SurfLock™
The SurfLock™ feature temporarily “memorizes” one channel to
the CH RTN button, so you can return to that channel quickly from
any other channel by pressing the CH RTN button.
To memorize a channel to the CH RTN button:
1 Tune the TV to the channel you wish to program into the CH
RTN button.
2 Press and hold the CH RTN button for a few seconds until the
message “Memorized” appears on the screen. The channel has
been programmed to the CH RTN button.
3 You can then change channels repeatedly, and when you press
the CH RTN button, the memorized channel will be tuned.
The TV will return to the memorized channel one time only. Once
you press the CH RTN button and then change channels again, the
CH RTN memory will be cleared and the button will function as
Channel Return, by switching back and forth between the last two
channels that are tuned.This feature also works for external inputs.
Switching between two channels using SurfLock™