CURRENT VERSION OF MAC OS HIGH SIERRA HOW TO
See below for further details of how to obtain this. This is made up from the model designator IM144 = iMac14,4, the code 88Z or sometimes AAPLEFI4 or AAPLEFI5, the version number 0190 B00, and the datestamp of that version 1809171521 = 18/09/17 15:21. The full eficheck version number is likely to resemble
I therefore provide those numbers, where known, in parentheses after the ‘new’ version number.
What is more, some models which share the same ‘new’ version number have different versions according to eficheck. The numbering system used by the eficheck tool still uses the older system with two hexadecimal numbers, e.g. That displayed in System Information uses five decimal numbers separated by dots, e.g 96.0.0.0.0, and is given below. If your Mac is a running Catalina and is a more recent model, then it should be using new EFI firmware as detailed here. If you are running an earlier version of macOS, such as El Capitan, then you should refer to the previous version of this list instead.
The following lists give the EFI firmware versions supported in the Mojave 10.14.6 Security Update 2020-004 amd High Sierra Security Update 2020-004 released on 15 July 2020. These changed in the Mojave and Security Updates released on 30 October 2018: the version number given in System Information is now completely different to that offered by the definitive system tool eficheck, and those installers contain many EFI firmware updates which don’t reveal their version numbers (in either numbering system). Until 30 October 2018, it provided usable version numbers in System Information, and macOS installers and updaters also gave details of any EFI firmware updates which they contained and installed. Apple doesn’t provide an official list of the current EFI firmware versions which should be installed on each model of Mac.
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