A shortcut to returning to life with a Roomba without replacing it or expensive repairs. Revive a Roomba that has stopped working due to board or sensor failure. It can be used by replacing the necessary parts. This is only the main board base unit (without screws). The following parts are required for use: ・Front wheel ・Tire modules (left and right) ・Edge brush module ・Main brush module ・Brushes ・Dust box (for 890/891/892/893) ・Battery ・Home base ・Four back cover screws