Panasonic KX-T336 System Reference Manual page 170

(Example) The following flow chart shows the operation sequence for System
Starting Up with default values using Panasonic KX-D4930 in VT mode.
* To start up the system using Panasonic KX-D4930 in Dumb mode, set
SYSTEM switch to "3" in above sequence.
START
MODE=5
SYSTEM=2
Power ON reset or Press
the RESET button
Confirm the
Initial screen
MODE=0
SYSTEM=2
Press the RESET button
END
2-F-7
MODE : Operation Switch
SYSTEM : System Administration Device
Selection Switch