820-00850: Stuck in DFU mode

Anyone seen this before, the board is constantly stuck in DFU mode, even without power applied. When power is applied, never goes into 20v. I've tried revive and restore with the same error coming up, see picture. Get this error with power applied and without.
 

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2informaticos

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Few threads (less than one month) mention the same error message.
People finally went into DFU after following the steps in the tutorial.

One example here:
 
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