I have a late 2013 Mac Pro that had been running Sierra before its internal SSD died. I'd like to replace the internal drive, but OWC's site indicates the following:

"macOS 10.13 and later versions include an EFI (firmware) update that adds support for the Aura Pro X to the host computer. If you do not first update the host firmware by installing macOS 10.13 or later onto the existing SSD, the Aura Pro X will not function properly once installed."

Is there a way to get the Mac's EFI updated using an external drive so it will be able to make use of the replacement internal drive?

Internet recovery allowed me to do a fresh Mavericks install on the machine, and I'm currently updating it to El Capitan, from which I'll hopefully be able to get Sierra running, but I'm expecting that High Sierra will give me trouble on the external drive.

Any recommendations? Thanks!

  • 1
    Besides not buying an Aura Pro X? You'd be better off with just about any other drive, vs jumping through hoops to get this one working. Commented Jan 13, 2019 at 3:27
  • What do you recommend? When I opened up the trashcan, I saw that OWC built the drive that was already installed, but I'm equally happy using other hardware if it comes more highly recommended. If that requirement is specific to a single vendor and can be circumvented by going elsewhere, that's good information.
    – Kevin Mack
    Commented Jan 13, 2019 at 3:33
  • 1
    So someone had already replaced the original drive, then, since Apple would never have shipped with that in it. I couldn't recommend a manufacturer, only report that my own experience with both OWC drives and Crucial drives (when installed in a Mac) has been poor. Commented Jan 13, 2019 at 3:48
  • Ah, that's useful information. It's entirely possible that the drive was replaced at some point since I don't know the machine's entire history. It looks like Transcend makes a compatible drive that doesn't appear to come with any caveats. Thanks!
    – Kevin Mack
    Commented Jan 13, 2019 at 4:58

2 Answers 2


The firmware updates are now included in macOS installs. Upgrading by installing High Sierra or Mojave to a USB external drive should cause the firmware to be updated. I have a external HDD with a APFS container partition. I installed High Sierra to this container using a 2011 iMac. I also installed Mojave in the same container (to a different volume) using a 2013 iMac. The firmware on both Mac was updated or I would not be able to boot from the external drive. (Although I can not boot Mojave on the 2011 iMac, which was expected.)

  1. update original OS hard drive to Mojave
  2. make time machine backup
  3. format a USB stick with APFS
  4. make a Mojave bootable installer from that stick
  5. shut down computer completely
  6. put Aura into mac pro.
  7. trick: boot from USB stick which is now APFS and mountable by boot loader with newer disk utility (included in Mojave installer)
  8. at this point you cannot direct install to drive BUT it will allow restore from time machine!!!!
  • This is not possible if the internal HDD or SDD is dead.
    – mr.cook
    Commented May 29, 2023 at 16:11

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