How to erase all transmitters on a Z Series receiver

How do I erase all transmitters on a Z Series receiver?

To erase all the transmitters memorised on a Z Series receiver, follow these steps: 
  1. Press P1 until the red LED on DL1 shows.
  2. Then release P1,  and press again and hold until both the red and green LEDs flash three times
The unit is then fully reset.

Info
This articles applies to the following products:
 RX26-Z1
 RX26-Z2
 RX26-Z4