You can only enter items you have defined as serial number controlled. Serial numbers are to appear as 1-000 or 2-001. This is for Linux users and an alternative to using GenSMBIOS. Avoid using letters before the version number. e,generated by system only ) but it is sequence one. 4 HTML osx-serial-generator VS securitytxt. If you need to generate new Serials this is one of the easiest ways to do that and add them to your new OpenCore config.