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Sep 1, 2014 2:50 PM in response to tims99by huaweifromgloucester,my mba not only keep showing update 2.9.1 but also brick and black screen after reinstall it. and i change the logic board (apple diagnose liquid damage the mba reboot again cost me lot ,and the update still there.i am scare to reinstall it again. i am going to make another appoint for it with apple.
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Sep 5, 2014 2:05 PM in response to tims99by huaweifromgloucester,i download it from apple webs and install it ,and finally disappear
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Apr 9, 2015 8:29 PM in response to tims99by baba19981,Check this article
ONLY GUID PARTITIONS CAN BE UPDATED
Firmware updates for Intel-based Macs require a GUID partition scheme - Apple Support

