I'm sure I've seen this before, but I upgraded an older MBP (2011) to an SSD. I boot to a High Sierra installer that i created and format it to Apfs, but then the drive is greyed out - it states it needs HFS+ to install.

Is this because this machine does not yet have the updated firmware that allows it to install on apfs?


  • Did you create your installer on a spinning-disk machine, or an ssd one? I seem to remember there being a different installer depending what was in the machine that downloaded it. – s1ns3nt Apr 26 '18 at 19:17
  • Yes, its the firmware update. I created the installer on ssd one. Once it had run through the installer and updated the firmware, I rebooted off the usb installer and the option to install to afps was enalbed. – piagetblix Apr 26 '18 at 20:18
  • 1
    You can convert the system from HFS+ to APFS after the installation is complete. – BaconDuctTape Apr 26 '18 at 20:23

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