This update is recommended for Mac mini (late 2012) models. This update addresses an issue that may prevent a USB keyboard from being recognized after the system wakes from sleep.Apple recommends all late-2012 Mac mini owners download the firmware update, which measures in at 4.8MB. It's available through the Software Update mechanism in the Mac App Store or directly through Apple's support website.
Today's update is the third firmware update the 2012 Mac mini has received since it launched in 2012. The first update in December of 2012 addressed an HDMI video flickering issue, and a second update released last month was a security fix that fixed an issue where EFI could potentially be overwritten without authorization.
The 2012 Mac mini is a previous-generation model that Apple replaced with the current Mac mini in 2014.