# macOS High Sierra

Apple’s High Sierra is coming. Below are some links to help prepare for it—

**Upgrade to macOS High Sierra**

- Model specific firmware updates are required (via the internet) for each system. Monolithic system imaging is therefore only supported to re-install macOS High Sierra. Please see this article for upgrade methods and supported <span class="caps">APFS</span> creation tools:   
    \*[https://support.apple.com/en-us/HT208020](https://support.apple.com/en-us/HT208020)

**Secure Kernel Extension Loading (<span class="caps">SKEL</span>)**

- Administrator or standard user approval is required before loading new third-party kernel extensions. A future version of macOS High Sierra will be able to use <span class="caps">MDM</span> to enable or disable <span class="caps">SKEL</span>:
- [https://support.apple.com/en-us/HT208019](https://support.apple.com/en-us/HT208019)

**Apple File System (<span class="caps">APFS</span>)**

- Upgrading to macOS High Sierra converts flash storage-based systems from HFS+ to <span class="caps">APFS</span> automatically. Systems with hard disk drives (<span class="caps">HDD</span>) and Fusion drives won’t be converted to <span class="caps">APFS</span>, but will support macOS High Sierra on HFS+ file systems. Apple File Protocol (<span class="caps">AFP</span>) is no longer supported from <span class="caps">APFS</span> volumes. <span class="caps">SMB</span> or <span class="caps">NFS</span> are supported file sharing solutions:
- [https://support.apple.com/en-us/HT208018](https://support.apple.com/en-us/HT208018)

**What’s New in macOS High Sierra:**

- [https://developer.apple.com/macos/](https://developer.apple.com/macos/)

**What’s New in iOS 11:**

- [https://developer.apple.com/ios/](https://developer.apple.com/ios/)

**What’s New in tvOS (11):**

- [https://developer.apple.com/videos/play/wwdc2017/209/](https://developer.apple.com/videos/play/wwdc2017/209/)

**Prepare your institution for iOS 11, macOS High Sierra, or macOS Server 5.4:**

- [https://support.apple.com/en-us/HT207828](https://support.apple.com/en-us/HT207828)

**Upgrade macOS on a Mac at your institution:**

- [https://support.apple.com/en-us/HT208020](https://support.apple.com/en-us/HT208020)

**Prepare for changes to kernel extensions in macOS High Sierra:**

- [https://support.apple.com/en-us/HT208019](https://support.apple.com/en-us/HT208019)

**Prepare for <span class="caps">APFS</span> in macOS High Sierra:**

- [https://support.apple.com/en-us/HT208018](https://support.apple.com/en-us/HT208018)

**Create a bootable installer for macOS:**

- [https://support.apple.com/en-us/HT201372](https://support.apple.com/en-us/HT201372)

**Move to <span class="caps">SHA</span>-256 signed certificates to avoid connection failures:**

- [https://support.apple.com/en-us/HT207459](https://support.apple.com/en-us/HT207459)

**Prepare for changes to Content Caching in macOS High Sierra:**

- [https://support.apple.com/en-us/HT208025](https://support.apple.com/en-us/HT208025)

Many thanks to Apple’s Tim Parker for the links!