81 is the current production firmware for the squeezebox.
Joe wants to update his transporter to the latest beta firmware.
Connecting to squeezenetwork will only allow him to reload the current production firmware 31, which he already has installed.
The latest nightlies come with TP firmware 36. Make sure you replace 33 with 36 in amcluesent's instructions.
After restarting the server the TP should reconnect and prompt you to update the firmware. You shouldn't need to force an update.