Updating firmware to get OWC Aura Pro X2 SSD to show via Macbook Air Basically I am trying to install a brand new Aura Pro X2 480gb SSD into a Macbook Air 2014, the original apple SSD has failed and is not seen by the Macbook Air. I know the Aura Pro X2 requires High Sierra as the previous system so the firmware updates via the Macbook Air.
But for some reason whenever I try to install High Sierra using a bootable installer via the Macbook Air, I get an error message stating that the computer is missing firmware partition on any device. I try to install High Sierra on to, been it a USB key or an external hard drive etc.
Is there anyway I can get High Sierra installed via a USB or external hard drive so the firmware partition updates, so I can then see the new Auro Pro X2 480gb SSD and install new system on to it?
I've tried formatting USB keys and hard drives in different ways but keep getting the missing firmware partition message on anything I do.
I have an old 2008 Mac Pro and also a 2011 Mac mini, if those can be useful in anyway to solving this issue I have.
The OWC installation video has the following caution message.

High Sierra has a firmware update. To install this update, there needs to be an working internal drive compatible with the existing firmware. The original apple SSD was compatible. The new Aura Pro X2 480gb SSD will be compatible once the firmware update is installed.
I assume you have not ever had High Sierra or a newer version of macOS installed on your Mac. I assume this true, because you state the Disk Utility on the High Sierra installer does not recognize the new Aura Pro X2 480gb SSD when installed in your Mac.
Trying to install High Sierra to an external drive does not solve your problem. The firmware that updates itself requires an internal drive.