Answer from OWC Support:
For an Air6,1 we do have a resolution:
Relevant Part Numbers:
OWCSSDAB2MB02
OWCSSDAB2MB05
OWCSSDAB2MB10
Affected Model IDs:
MacBookAir6,1
MacBookAir6,2
The update resolves the following issues:
- 10.13 EFI host update requirement - Previously the host computer required the 10.13 upgrade be installed via the Apple SSD as a first step. This firmware update allows the host and the Aura SSD to receive their respective 10.13 updates at the same time (i.e. a single installation).
- Hibernation Issues
- Cold boot issue on MacBookAir 6,1 and MacBookAir 6,2
As a first step, please download both of the installer files:
Firmware Utility:
http://download.macsales.com/kb/msu.dmg
Firmware Update:
http://download.macsales.com/kb/OWCAuraFirmwareUpdate.bin
Once you have downloaded both files, please open the 'msu.dmg' file and follow the installation instructions.
Once finished, proceed to these steps:
1. Launch the Firmware Utility. At the login screen, please type the login credentials for your Mac's administrator account.
2. From the default screen, select the 'Adapter 0' item in the sidebar. Your screen should look similar to the one below.
3. From the 'Operation' menu, select the 'Update' command.
4. An update screen will appear, displaying the current firmware as version 2.3.0.1065.
5. Now click the 'Choose File' button at the top of the dialog. From the Mac dialog that appears, select the OWCAuraFirmwareUpdate.bin file that you downloaded earlier. Note: it may be in your 'Downloads' folder by default.
6. The update screen will show that the file has been chosen and is ready. Click the 'Update' button.
7. Once the update is finished the screen will display a message that it the update was successful and the host should be restarted. Close this window then restart your Mac.
8. Once the computer has restarted, open the Firmware Utility again to check the firmware version by selecting 'Adapter 0' again. Make sure the version is 2.3.15.1067. If so, this completes the update process and you can quit the updater app. If not, please start over at step one and try again or contact our tech support team.