All error codes By model: T1100T1500T1700T2300T2500T610T730T830T930Z5200Z6Z6200Z9 Model T2300 Error Code 74.08:04 Problem Description Problem with the firmware upgrade process Corrective Action Options Reboot, try again, download from HP as file may be corrupt, repalce the Touch Control Panel Schedule Service Call ⭢ (301) 340-0000 Email ⭢ Contact Us