I forgot my password. How do I reset NETIO PowerPDU 4C to factory defaults?

For the up-to-date procedure, see the product manual – look for “Forgotten password”. To restore factory defaults:
“To restore factory defaults, press and hold the buttons for outlets 1 and 2 and turn on the device. Keep the buttons pressed until the device beeps 3 times. While restoring factory defaults, all LEDs for the outlets flash red. As soon as the reset is finished, the device beeps twice.“