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I have a 15-inch MacBook Pro late 2011. System Information gives me the following firmware versions:

EFI Boot Rom Version: MBP81.0047.B2C

SMC Version (system): 1.69f3

Apple provides the following web site for downloading firmware upgrades: https://support.apple.com/en-us/HT201518

On this website the following downloads are available for my system:

EFI Boot ROM version: MBP81.0047.2AB (2015-001)

SMC version: 1.69f3 (SMC 1.5)

The SMC version is the same as the one installed on my system, so no need to update anything.

However, there is a discrepancy with regard to the EFI Boot ROM versions (installed MBP81.0047.B2C vs. MBP81.0047.2AB). How can I tell whether the ...2AB version is a newer version than the ...B2C version on my system? Will the upgrade programme check during the upgrade process? I

  • What version of the Mac OS are you running? – kenjikato Jan 2 '16 at 11:12
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The updater program will check to see if you already have the latest version of the Firmware. Taken directly from the Apple web page that you linked to:

If you try to use a manual updater that's not designed for your Mac, or if it's not needed, the installer alerts you and the software isn't installed

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