Today, due to some scanning issues we've been experiencing following some major changes to our network, we decided to update our Xerox ColorQube 9303's firmware from version 071.180.203.05402 to the latest version, 072.180.004.09101. It did not succeed, our machine is now stuck constantly trying to power on and it never fully succeeds. I've been very patient with it, being unwilling to unplug it due to the sensitive nature of firmware... but it's not changing, and we're well past the 30-40 minutes that it recommends.
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I would suggest that you review the following site and check to see if the various solutions may help you. Xerox 9303 Product Support
I searched for "firmware update failed" and got many possible solutions.
If that does not resolve your issue you may consider contacting our specific product support experts at the following link:
Fast Track to the Expert
We had our Xerox support guys on site, and they not only fixed the issue, but had some words of wisdom for myself and the rest of our IT team with regards to maintaining these devices. Thanks!