Allied Telesis AT-WA7501 - Manual (Page 260)

Chapter 8: Managing, Troubleshooting, and Upgrading Access Points
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Once the TFTP transfer is complete, the access point will begin
booting the image that was just passed to it. This image is only
resident in RAM. If you reboot the access point or if the access point
loses power, the AP824X.DNL image will be lost.
5. Type this command to remove the static ARP cache entry from your
PC.
arp –d IPaddress
where IPaddress is the access point IP address you assigned in Step
1.
When the access point is done booting, all access point services are
available. You can now telnet to the access point to upgrade it with a
permanent image and configure it.
Note
You may be unable to access the web browser interface if the
support files for this interface still need to be recovered. If so, use
telnet to upgrade the access point, and then use the web browser
interface to configure it.