How can I re-enable my Facebook login after I’ve been blocked temporarily because of connecting from an unrecognised PC?

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I have login approval and I used to log in to my Facebook account from 2 different computers,so if I log in from another one, FB sends me a note to the other computer to ask me if I recognize this device.

Recently I delete all history information from both computers, so I log in and type my email and password and M unable to access my account because I can’t receive the security code. After multiple times FB said I’m temporarily blocked. What can I do?

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