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- #Install mac os sierra from scratch install#
- #Install mac os sierra from scratch upgrade#
- #Install mac os sierra from scratch iso#
So proceed at your own risk, and have a macOS Catalina bootable installer standing by, just in case. That is possible but I don't know how likely it is. Now, all of this assumes that macOS updates that you have previously installed have not updated the firmware on your Mac to the point that macOS Sierra won't work.
#Install mac os sierra from scratch install#
When that is done quit disk utility and select the option to install Mac OS Sierra on the drive you just formatted.
#Install mac os sierra from scratch iso#
This will, of course, remove everything from the drive so do be very sure about your backup. But, you wont re-boot into the OSX installation phase, youll restart the whole installation again from scratch Houston, we have a problem If youre observant, youll notice a quick message coming up, right before the VM boots again from the ISO to restart the whole installation process: Boot Failed. Instead go to the Utilities menu > disk Utility and reformat the internal drive. It may take a while.Įventually you will be asked to select a language and be given a window with several options. When you get to the Startup Manager screen select the Sierra installer and let it boot. Once the bootable installer has been created on the flash drive and with the flash drive plugged into your Mac (and a backup of your Mac somewhere safe and disconnected). I use this method as I like me some GUI apps. Or you could use something like DiskmakerX you can create a bootable macOS Sierra install disk a different way. sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled -applicationpath /Applications/Install\ macOS\ Sierra.app Then using the command Apple recommends using (at least 8GB) flash drive create your bootable installer. I have heard that setting the clock back a number of years will also fix this issue. (or here: ) Note that if you are getting an error message about a damaged installer it may be that the installer is old and the certificate in it is expired.
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You should be able to download Sierra from the App store. I'm going to assume you know your way around a Mac enough to fill in the blanks. So is there no easier way? An "Installing Sierra for Dummies" way? I could re-download and if it's not 'damaged,' I could copy it all over onto an external drive to install but that external drive would have to be a bootable drive as well - more new things to learn and more pitfalls. Inside the app wrapper is 'InstallESD.dmg.' " This may be because the download was interrupted and restarted.
#Install mac os sierra from scratch upgrade#
Sierra is still available as an upgrade on the App Store but as a direct install and 'visible' only to O.S.'s up to and including Sierra, so you can't directly revert to an earlier O.S. you wanted used to be so easy when Macs came with DVD-Rs. I've written 'straightforward, foolproof' because it appears that experienced persons have run into trouble doing this and I do not do sysadminey stuff to begin with. I am looking to install Sierra from scratch in a straightforward, foolproof manner on an Air currently on Catalina.