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His private key is working, but his master is not working, so I suggest him to create a new account and just send his coins to that new account, I think this is the best option, because we don't know what will happen next if someone has access to that master key.

We can try but he has to come to the terminal ( he did now he meds to add an intro and all is ok ) but your way is a possible one aswell, only the rep
Is gone from the old account t