support.apple.com/kb/HT2434
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Firmware updates for Intel-based Macs require a GUID partition scheme - Apple Support
Firmware updates will not install on an Intel-based Mac if the computer is using a non-standard partition scheme, such as an fdisk scheme. You may see an "unexpected error occurred (0); unable to upgrade firmware" error message, or your computer may start normally (after a single beep if the power button is held) when attempting to install the firmware update.
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Firmware updates for Intel-based Macs require a GUID partition scheme - Apple Support
Firmware updates will not install on an Intel-based Mac if the computer is using a non-standard partition scheme, such as an fdisk scheme. You may see an "unexpected error occurred (0); unable to upgrade firmware" error message, or your computer may start normally (after a single beep if the power button is held) when attempting to install the firmware update.
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Firmware updates for Intel-based Macs require a GUID partition scheme - Apple Support
Firmware updates will not install on an Intel-based Mac if the computer is using a non-standard partition scheme, such as an fdisk scheme. You may see an "unexpected error occurred (0); unable to upgrade firmware" error message, or your computer may start normally (after a single beep if the power button is held) when attempting to install the firmware update.
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- og:titleFirmware updates for Intel-based Macs require a GUID partition scheme - Apple Support
- og:descriptionFirmware updates will not install on an Intel-based Mac if the computer is using a non-standard partition scheme, such as an fdisk scheme. You may see an "unexpected error occurred (0); unable to upgrade firmware" error message, or your computer may start normally (after a single beep if the power button is held) when attempting to install the firmware update.
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