Apple today released Thunderbolt Display Firmware Update 1.2, designed for the Thunderbolt Display that was released in 2011. According to the release notes, the update improves reliability when connecting devices to the Apple Thunderbolt Display and addresses a rare issue that may cause the display to go black. Thunderbolt Display owners can download the update from the Mac App Store. Thunderbolt Display Firmware updates are fairly rare, with the last firmware update released in to fix an issue with fan noise.
