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The manufacturer said that the partition can close itself when accessed in "illegal way" (other pc, etc) and that is done to protect their code.
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I am not an expert, but this seems to mean that the manufacturer has implemented some kind of software which deletes all the available keys or overwrites the header of the LUKS device. It is supposed to be an unrecoverable method unless you have backed up the headers.
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I need your help in this: Could it work out if I do dd of the entire "alive" drive. and dd it to the damaged ones? Is it possible that this operation can be detected by their software? Again I'm not interested in their code at all. We just need to bring it back to live.
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If you just boot a reliable Live system which does not try to mount the partitions by default, then the dd operation you suggest should be possible and undetectable by software means. No guarantees are given, though.
You should ask this question to the provider and ensure it is legal, anyway.