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I believe by “first unlock” they mean a login/unlock right after a reboot. So - turn on device, do first unlock, then lock again. Might be wrong, but afaik the very first unlock after a reboot is bit different then subsequent unlocks (I guess cached memory etc)

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Yup. it's exactly this. After first unlock, data is decrypted and loaded into memory. You shouldn't be able to extract it though, without unlocking the device.

Ahhh I see. Thank you! There goes my dream of the 5000 dollars. ;)

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