How to connect to Mikrotik (RB750) when I disabled interface

Hello, I have the following problem. I would disable on mikrotik bridge created by me, but I instead of this disabled interface for connection to the mikrotik. Is any chance how to restart mikrotik to the default(factory) settings? I tried reset button but it doesnt work. Winbox dont show any MAC address.

P.S.Mikrotik have empty password.
Sorry for my english.

Thanks

Use NetInstall and uncheck the box to keep the current configuration.