How to reset a Deliberant AP to Factory Defaults (CPE 2n)

From the manual available at the Deliberant Support Site:

Resetting to Factory Defaults
Deliberant products have the capability of being reset to defaults by pinging the device with a certain
packet size when the radio is booting.
During the startup of the device, when the drivers of the ethernet interfaces are loaded, the discovery
daemon is started. The daemon suspends startup process for 3 seconds and waits for ICMP "echo
request" packet of length 369 bytes. If the packet received, the discoveryd resets the device to default
configuration.
Steps to reset to default settings:
Step 1. Power off the device.
Step 2. Obtain the device MAC address.
Step 3. Connect a PC to the same physical subnet as the device.
Step 4. Execute 'arp -s' command to assign the IP address (IP address should be from the same
subnet as PC) to the device MAC address:
      arp -s [ip address to assign] [device address]
Step 5. Start pinging the device:
  For linux users:
      ping [ip address] -s 369
  For Windows users:
      ping [ip address] -l 369 -t -w 0.2
Step 6. Power up device and wait about 30sec or more (depends from device hardware).

I tested these steps with Deliberant AP Solo, Duo & CPE 2-N. Sometimes it takes a long time, but eventually will work.