Determining BootROM or Firmware Version

This article tells how to determine the BootROM or Firmware version on Apple computers introduced after 1998.

This article has been archived and is no longer updated by Apple.

There are two ways to check the revision of the boot ROM.

Apple System Profiler 2.1.2 or later provides Boot ROM revision information. To view the revision information, choose About Apple System Profiler from the Apple Menu. On the System Profile tab under the Production Information selection the following information appears:

    Production information
    ROM revision: $77D.44B5
    Boot ROM version: 1.1f4
    Mac OS ROM file version: 1.3
    Serial number: XB00000000XXX-XXX
    Software bundle: 694-1137
    Sales order number: Not applicable


The version of Apple System Profiler that shipped with Mac OS 8.5 or 8.5.1 retail packages or updates does not include this information. Mac OS 8.6 includes version 2.2 which has this information in the System Profile information. For computers that do not have the correct versions of Apple System Profiler you must check the ROM revision in Open Firmware. To view the revision information:


    1. Shut down.
    2. Start up and hold down cmd-opt-o-f
    3. The Boot ROM Revision is displayed at the top of the screen.
    4. Type "bye" followed by <return> to continue starting up in Mac OS.
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