The Mac Wi-Fi Update improves compatibility with the 5GHz band of Wi-Fi
Boot ROM or SMC Version Information. To confirm that the update was applied, the CFBundleVersion string from the AirPortBrcm4311.kext must be checked
AirPortBrcm4331.kext CFBundleVersion = 612.20.15
/System/Library/Extensions/IO80211Family.kext/Contents/PlugIns/AirPortBrcm4331.kext/Contents/Info.plist
Version 1.0: