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Now it is getting a bit clearer: As mentioned by knc1, newer fw versions contain a new flag "Disable Authentication on First Connect".
It looks like a pattern is showing up: All new devices right out of the box probably allow a (single?) downgrade to a factory build firmware, provided that they aren't registered yet, and/or haven't got an OTA update. First out-of-the-box fw with this behaviour could be 5.8.9.0.1. And it even might be true for the 5.9.* crap...
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