Download the macOS Sierra installation package from the Mac App Store. Once it has downloaded, follow these steps to create a USB bootable installer. Open Disk Utility (found in the Applications/Utilities folder), select the thumb drive in the sidebar and click the “Erase” button.
How clean install macOS High Sierra from USB?
Create a bootable macOS installer
- Download macOS High Sierra from the App Store. …
- When it’s finished, the installer will launch. …
- Plug in the USB stick and launch Disk Utilities. …
- Click the Erase tab and make sure Mac OS Extended (Journaled) is selected in the format tab.
- Give the USB stick a name, then click Erase.
How do I do a clean install of macOS Sierra?
How to Perform a Clean Install of macOS High Sierra
- Step 1: Backup Your Mac. As noted, we’re going to completely erase everything on the Mac. …
- Step 2: Create a Bootable macOS High Sierra Installer. …
- Step 3: Erase and Reformat the Mac’s Boot Drive. …
- Step 4: Install macOS High Sierra. …
- Step 5: Restore Data, Files and Apps.
How do I download macOS High Sierra installer?
Download the macOS Sierra installer
Launch the App Store app, then look for macOS Sierra in the store. (Here’s a link.) Click on the Download button, and your Mac will download the installer to your Applications folder. If it automatically launches after download, quit the installer.
How do I install macOS High Sierra from USB on Windows?
To create a bootable USB drive with macOS, use these steps:
- Download and install TransMac on Windows 10. …
- Connect the USB flash drive. …
- Right-click the TransMac app and select the Run as administrator option.
- Click the Run button.
How do you make a fresh install of macOS?
Hold down Command and R (⌘ + R) at the same time. When you hear the startup chime (or when the screen goes black on newer Macs), keep holding the keys until your computer reboots. Click on Reinstall a new copy of macOS. Click Continue.
How do I reinstall High Sierra on my imac?
Hold down Option-Command-R as you turn on or restart your Mac. Release the keys when a spinning globe appears. This will boot the latest version of Recovery Mode over the Internet, which will offer to install macOS High Sierra. When the main Utilities window appears, select Disk Utility and continue.
Why is Mac High Sierra not installing?
To fix the macOS High Sierra problem where the installation fails due to low disk space, restart your Mac and press CTL + R while it’s booting to enter the Recover menu. … It may be worth restarting your Mac in Safe Mode, then trying to install macOS 10.13 High Sierra from there to fix the problem.
How do I wipe my Mac and reinstall Big Sur?
Steps to clean install Big Sur
- Step 1: Remove all the junk. …
- Step 2: Create a secure backup of your Mac. …
- Step 3: Download the Big Sur installer. …
- Step 4: Create a bootable USB installer. …
- Step 5: Erase your startup drive. …
- Step 6: Clean install macOS 11 Big Sur.
How do I do a clean install on my Mac?
Step 4: Wipe your Mac
- Connect your boot drive.
- Start up – or restart – your Mac while holding down the Option key (also known as Alt). …
- Choose to install your chosen version of macOS from the external drive.
- Select Disk Utility.
- Select your Mac’s start up disc, probably called Macintosh HD or Home.
- Click on Erase.
How do I boot a Mac from a USB drive?
Press and hold the “Option” key when you hear the startup sounds—this will bring you to the Startup Manager. Once the Startup Manager appears, you can release the Option key. Startup Manager will then start scanning your device for drives it can boot from, including your USB.