Allied Telesis AT-WA7501 - Manual (Page 244)

Chapter 8: Managing, Troubleshooting, and Upgrading Access Points
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This screen appears.
2. Click Restore Factory Defaults. Under Pending Changes, you will see
a list of what parameters need to be changed.
3. Click Save Changes and Reboot. When the access point is done
rebooting, it will use the factory default settings as its active
configuration. You may need to reset the IP address and other network
parameters.