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Apple Computing Products:
macOS - Notebook Hardware
MacBook Pro Retina update to Catalina without working hd
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<blockquote data-quote="ferrarr" data-source="post: 1843168" data-attributes="member: 376394"><p>If you can access a Mac with an older OS version, make a bootable external of an older OS version. Then you can start this MBP up with that external drive and when you go to upgrade, it may activate the required EFI? </p><p></p><p></p><p>macOS update downloads - <a href="https://support.apple.com/en_US/downloads/macos" target="_blank">Apple - Support - Downloads</a> </p><p>Firmware updates info - <a href="https://support.apple.com/en-us/HT201518" target="_blank">About EFI and SMC firmware updates for Intel-based Mac computers - Apple Support</a></p></blockquote><p></p>
[QUOTE="ferrarr, post: 1843168, member: 376394"] If you can access a Mac with an older OS version, make a bootable external of an older OS version. Then you can start this MBP up with that external drive and when you go to upgrade, it may activate the required EFI? macOS update downloads - [url=https://support.apple.com/en_US/downloads/macos]Apple - Support - Downloads[/url] Firmware updates info - [url=https://support.apple.com/en-us/HT201518]About EFI and SMC firmware updates for Intel-based Mac computers - Apple Support[/url] [/QUOTE]
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Apple Computing Products:
macOS - Notebook Hardware
MacBook Pro Retina update to Catalina without working hd
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