#Clean reinstall mac os sierra install#

#Clean reinstall mac os sierra install#

The expected way to produce macOS install media is to download the installerįrom App Store/Software Update, and run the createinstallmedia command-line Unfortunately, making a USB stick with the macOS installer on it is a nuisance. The best, safest, least error-prone way to do an install is with a USB stick. Installer from Recovery/App Store (any macOS version)īonus tidbit 2: using Terminal from Setup Assistantīonus tidbit 3: creating an image of the install media might not workīonus tidbit 4: don’t bother restoring a Time Machine backup Making install media out of partial macOS installers (“not a valid OS installer application”)ī. Making install media with El Capitan (with access only to Recovery) (requires another Mac and a USB-C cable.)

If you’ve got an Apple Silicon Mac, you probably want to perform If your Mac can’t, you’ll need to look for helpĮlsewhere. Note: This blog post is written for Intel Macs, particularly those that canīoot OS X El Capitan (or macOS Sierra, but that’s untested). Neither Chris Warrick nor Apple will be responsible for anyĭamage to your devices caused as a result of using information in this post.

What to try (as long as you’ve got an Intel Mac).ĭISCLAIMER: All information in this post is provided as-is, and some of it may But I now have some experience and assorted hints on Throughout the process, manyĪttempts failed miserably. Recently, I reinstalled macOS on my device.