There is no way of performing password recovery without reloading the router. I am afraid that you will either have to try to remember the password (perhaps you have inadvertently configured a whitespace at the end so you need to type in the space when entering the password as the last character before hitting Enter), try to access the console or the aux port in hopes that they are configured differently and perhaps allow you an access to the device, or schedule a maintenance window to perform the password recovery. I am sorry but I see no other way.
Best regards, Peter
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