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Original post by: Israel Curtis ,

Text:

Spent two solid days trying EVERYTHING to get the firmware to actually take on boot (success with the tool, no errors, proper firmware in place, etc etc) — Held down the button all sorts of times, but firmware loader never kicked in, drive trays never ejected. Finally managed to get 10.9 Mavericks installed on a second drive (had already tried 10.10 yosemite on second drive, same issues), and ran the firmware patching tool, everything looked the same — but this time after the beeeeeep the drive trays actually popped out and the firmware got written!

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open