IMac (Retina 5K, 27-inch, Mid 2015)



The iMac (Retina 5K, 27-inch, Mid 2015) was released on 2015.

The firmware identifier is iMac15,1.

Operating System

 * First Release: OS X Yosemite (10.10)
 * Latest Release: macOS Big Sur (11.7.10)