The iMac (Retina 5K, 27-inch, 2020) was released on 4 August 2020.
There are two firmware identifiers, iMac20,1 and iMac20,2.
Operating System
- First Release: macOS Catalina (10.15)
- Latest Release: macOS Sonoma (14.4.1), macOS Sonoma (14.4.1)
- Latest Beta Release: macOS Sonoma (14.4 RC), macOS Sonoma (14.4 RC)