BIG-IP initial account setup issues

I ran into an issue durung the initial setup on a new BIG-IP (11.x) LTM appliance. I have created a new account to log into the WebUI however I did not have enough time to complete the initial setup before my session timed out. When I returned to log back into the device to continue configuration I found that I am unable to log into the device with the credentials that I have just set up. I have tried logging into the webUI and console using the default passwords with no success. I understand that creating credentials during the initial setup disables the default account but is there any other way to regain access to the appliance?