This field safety notice (FSN) provides information about an identified software anomaly that is associated with the use of ventilator software on the ventilator Hamilton-C6. In addition to the steps to follow as identified in the FSN, the newest available software version 1.2.3 contains the required fix and shall be installed without undue delay to minimize overall risk during use of Hamilton-C6. Recall start date: May 17, 2024