About Mac Wi-Fi Update 1.0 This update is recommended for all late 2012 Mac systems. This update improves compatibility when using the 5GHz band in Wi-Fi. Boot ROM or SMC Version Information: To confirm the update has been applied, the CFBundleVersion string of the AirPortBrcm4311.kext will need to be checked. New driver delivered in update: AirPortBrcm4331.kext CFBundleVersion = 612.20.15
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