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Can we somehow help him recover his account? They have changed the keys.

But how hacker get the master key....

you can restore using master key

recover using this link

https://wallet.hive.blog/recover_account_step_1

I think they changed the master key right away.

But how did the master go to the hacker, maybe the posting or the active key could go, but how did the master get it?

Any how to contact @pa.... On discord

Contrabourdon writes the address in the main text of the post