

Fortunately, the restriction isn't hardwired. Without this, the process of reading, deleting, or moving data can slow down as the SSD maintains information that is no longer used. Unfortunately, Apple only enables TRIM on its own drives, in a move to perhaps discourage customers from going the aftermarket route. They can help diagnose any hardware issues that may be causing the problem or provide additional troubleshooting steps.TRIM is the command that lets an operating system tell an SSD which blocks of data are no longer in use and can be wiped, preparing them for the next write. You can find instructions on how to do this on the Apple website.Ĭontact Apple Support: If you've tried all of these steps and are still having issues reinstalling High Sierra, you may want to contact Apple Support for further assistance. Hold down the Option-Command-R keys when starting up your MacBook Air to access the latest version of macOS that's compatible with your Mac, or Option-Shift-Command-R to upgrade to the latest version of macOS that's compatible with your Mac.Ĭreate a bootable installer: If none of the above steps work, you can create a bootable installer of High Sierra on a USB drive using another Mac. Try a different internet recovery mode: If internet recovery still isn't working, try using a different internet recovery mode.

To do this, go to System Preferences > Network > Advanced > DNS, and make sure "Automatically" is selected. Try a different Wi-Fi network: If you're using Wi-Fi, try connecting to a different network or using a wired Ethernet connection instead.Ĭheck your DNS settings: Make sure your DNS settings are set to automatic. If your internet connection is slow or unstable, it could be causing issues with the internet recovery process.

If your MacBook Air A1466 is not allowing you to reinstall High Sierra after wiping the SSD in recovery and internet recovery doesn't work, there are a few things you can try to troubleshoot the issue:Ĭheck your internet connection: Make sure your MacBook Air is connected to the internet via Wi-Fi or Ethernet cable.
