The Consumer Product Safety Commission and Future Motion are recalling 300,000 Onewheel self-balancing skateboards due to four reported deaths. The recall comes after the company initially challenged previous warnings, claiming they were unjustified and alarmist. A software update will be provided for newer models, while owners of older models are advised to stop using and discard their boards. The recall aims to address issues with the boards malfunctioning and causing crashes.