The second requirement is that the system needs to be connected to a reliable power source to install firmware updates. The first requirement is to ensure that your operating system version is fully updated, so if you see any system updates in addition to the firmware update available, install those first. ![]() There are some special requirements for handling firmware updates as opposed to standard software updates, and if they are not met, the system may fail to install the update. As such, you may see the update still showing in Apple's Software Update service. ![]() If you have an update available but do not see the progress bar when applying it, it may not have installed properly. When Apple releases Mac firmware updates, the system undergoes a special installation procedure in which it shows a progress bar on a gray screen and then reboots.
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