If you loose the ADMIN password for the HD300 series then you need to do a complete menu reset. This is done following the process below
For WJ-HD316A:
1.Turn off the unit
2. Press and hold buttons 1 and 6 on the front.
3. Turn on the unit whilst keeping the above buttons held down.
4. Keep the buttons held down until the Panasonic screen appears (approximately 25 seconds).
5 The unit will then boot up and once fully loaded the menus (and passwords) will be reset.
For WJ-HD309A:
1. Turn off the unit
2. Press and hold buttons 1 and 5 on the front.
3. Turn on the unit whilst keeping the above buttons held down.
4. Keep the buttons held down until the Panasonic screen appears (approximately 25 seconds).
5 The unit will then boot up and once fully loaded the menus (and passwords) will be reset.