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Ok. I could install 1.8.1 from an img (not a zip) found on the chinese Onyx forum. I installed it with FactoryTool.
Second, the "unknown serial number" is normal, so I guess that was not the reason why the Boox help team left my Facebook message on "seen".
Third, I'm downloading the 1.8.2 update.zip from baidu (it's very slow), found on the same forum. I will update this post when I can try this update.
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