When trying to upgrade my ZD1000 firmware from version 18.104.22.168(yes very old) to the latest, it just says "uploading..." after I click on the firmware file that I want to upload. I don't think it takes 30 minutes to push the firmware to the device.
Unfortunately you can't upgrade directly. You need to do quite a few stepwise upgrades to move up from a version that old. Please contact support so they can help you through this - we probably don't even have your next valid release posted to the support site.
It would have been about 3 years ago 🙂 Now not so much since you've got so many to go through. We did open up the download restriction on the final release for the ZD1000 (it's now EOL and no longer actively supported). I could open up the others, but it still won't help you as you need to get some versions that are tucked away in the archives.
Like virtually all enterprise network vendors, we do normally restrict access to software upgrades to customers with either active support contracts or remaining SW warranty (which is 90-days from receipt).
Open a case with us and ask for Michael Brado. I'm an old-timer and might
still have some of the old ZD1000 firmware images. You may not be able to
upgrade higher than 7.1 however, if you have one of the very early/initial ZD1ks.