[quote|format=featured]When plugging it into the computer, it shows the unit is in DFU mode, and says the firmware is on an unofficial build. Trying to restore it to a previous version[/quote]
That's surprising, we use a debug firmware version at the factory to thoroughly test the unit before shipping. It's possible this unit missed the "reload the official firmware" step afterward. There are loads of other possibilities, but it was the first that came to my mind. [br]
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Good idea plugging it in and changing the firmware with the website. Choosing any one of the official builds ought to bring it to a workable state. Please let us know if it does not.