(I believe this is the default operation.)Ħ.) Boot from the USB drive (this will boot into Lion.)Ĩ.) Restart. This puts you into Recovery Mode.ĥ.) In Recover Mode, install Lion onto the USB drive. I partition the drive with one partition, click Options, and select GUID Partition Table)Ģ.) Shut down and remove the internal hard drive from the MBP.ģ.) Connect to the internet (I connected via ethernet, but you can also connect via wifi from Recovery Mode)Ĥ.) Start the computer with the USB drive connected. ![]() If I recall correctly, I did it this way:ġ.) Connect an external USB (or Firewire or Thunderbolt) drive and erase the USB drive before starting. I was finally able to update the firmware. ![]() The problem is that the firmware update only works when performed from Lion.
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