Chosen Solution
Hello, I just bought a new SSD Owc for my mac Air 13 A1466 mid2013 but it doesn’t show up anywhere. So now I am running my laptop from an another external drive on Moutain Lion I’ve been reading that I have to be on High Sierra to find the SSD OWC but I am not able to update to High Sierra because “you may not install to this volume because the computer is missing a firmware partition”… I tried to re-install everything but nothing is working. Do you have any advices for me to make the update possible and then find the new SSD I bought ? Thank you a lot, Kinds regards, Yv'
Take a look at this: How to Format a New Internal SSD in MacOS High Sierra and you may need this Aura SSDs Firmware Update
