



Next select the “ Restore” section and click the “ Image…” button next to the “ Source” input field.Ī window will open in which you have to select the previously copied or moved “ InstallESD.dmg“, and then click “ Open“. Open Disk Utility (you can find in the “ Utilities” folder of your “ Applications” folder, or you can use Spotlight to find it).įirst we must find our USB drive on the left side of the Disk Utility window – make very sure that you’re picking the right device, since the drive will be completely erased! In my example I’m using a 64Gb Kanguru eFlash (very fast USB pen drives and great customer service!).įirst select the correct drive and partition. As you can see in the image below I selected a partition of the 64.39 Gb drive. Step 5.CAUTIONThe drive will be completely wiped in this process! Now, go to the /Downloads folder, right-click on the Big Sur image file and then click on Show Package Contents Go to the /Applications folder and drag it to /Downloads Make sure the macOS Big Sur image file is in your Downloads folder. Connect your USB drive into your Mac's USB port Read this post on how to do that: Download macOS Big Sur 11 / 11.0.1 Final Installer, Available for All Compatible Macs Make sure you have downloaded the macOS Big Sur installer and place it inside the Downloads folder.Connect the flash drive to your Mac and erase it using Disk Utility.Grab hold of a USB-A / USB-C flash drive with at least 32GB of onboard storage.Backup everything to iCloud or use an external drive to do so.Don't worry, that's why you are here and we will guide you through it all. That's not all, you have to go through other things as well, such as creating a USB installer for macOS Big Sur. The downside? It will wipe your drive clean, meaning you have to backup everything before you go ahead with it. Clean installation is the way to go if you want to experience a new OS at its maximum potential. But, you might run into performance issues.

If you are going for an over the air installation, it's plain and simple.
