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    Updating firmware on an imac

    So I put an X25 in place of my Superdrive in my new i7 i Mac.I had no problem booting off the Snow Leopard disc form an external USB DVD drive. If I hold C during boot the disc spins like it wants to boot then I get the flashing Apple/? I installed Refit and it sees the disc but when it boots it fails and I get a message that says that newer EFI Macs have trouble booting legacy operating systems from USB devices.If the number for your Boot ROM Version is earlier than the one listed on the website for your Mac, click the link to download the firmware.Double-click the installation package when it finishes downloading and follow the prompts in the installer to update your Mac's firmware. After the computer shuts down, hold down the power button until the power indicator light blinks.Firmware provides the instructions for the hardware on your Mac to run correctly.The instructions control many low-level functions that affect the power, thermal and sleep management features.I tested the disc in my Mac Book Pro and it booted fine and saw the X25 in there.So anyone have a workaround for this besides pulling the drive out and doing it in another system?

    updating firmware on an imac-45updating firmware on an imac-83updating firmware on an imac-24

    It found that many of the Macs weren't receiving proper security updates, leaving the Extensible Firmware Interface (EFI) vulnerable, according to a press release.

    So, even with some updates, user machines were vulnerable to disclosed vulnerabilities like Thunderstrike 2.

    EFI firmware controls some of the boot functionality of a machine, and offers a high level of permission for attackers that can successfully compromise it.

    Updates installed in the last 30 days appear below this list.

    Information about products not manufactured by Apple, or independent websites not controlled or tested by Apple, is provided without recommendation or endorsement.

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