Hi. I flashed a T300 to use the Unleashed firmware and now I would to convert this back to the original firmware but cant see an option within the unleashed GUI to do this. Is this possible?
Yes, this is possible. First you have to set it to factory default settings. Second in the Setup Wizard after connecting to the configure.me SSID in the wizard is an option for show ap info -> choose Upgrade, there you choose the standalone image, flash the device and reboot -> Done
Documented in KBA-5193: Can I convert an Unleashed AP to ZoneFlex Standalone/Controller managed mode?
Converting Unleashed to Zone Flex was straightforward when the interface was like the KB posted by Michael. For several release now that option has been removed. You have to go through the unleashed setup wizard, wait for the AP to build the unleashed network, login, go to administer/upgrade - and then finally you can upgrade to the model specific base 104 image, or if you're willing to put up with bugs, upgrade to the latest base 110.