· Initiate the installation while you’re in safe boot mode – Go to the Applications folder and double-click on the “Install macOS High Sierra” app. The install should go seamlessly without any issues and the entire process should take around 45 to 50 minutes. During the process, the system will reboot several times.
I had the same issue trying to install High Sierra on my late 2011 MacBook Pro, in which I'd replaced its mechanical HDD with an SSD. The fix was to download the latest version of the High Sierra installer from the App Store and run that - it is version 13.1.05 at the time of writing. Make sure you delete any existing installer you might have first.
· Hi there, what worked for me was to restart in Safe Mode (Hold Shift while restarting) and then run the app upgrade. The OS was somewhat slow in Safe Boot but the upgrade went smooth (approx 40min) from the app store. Also AFPS file system was installed on the system disk, whereas Bootcamp partition (NTFS) on the same disk was kept intact as well as ExFAT file system on my other …
· Hello, I am trying to upgrade my 2018 MBP from High Sierra (latest) to Mojave. However, the installer returns "An error occurred installing macOS" error after running ...
· Free up space.In some cases, macOS will fail to install because it doesn't have enough room on your hard drive to do so. To see how much you have available, click the Apple logo > About This Mac > Storage.You'll see a breakdown of what's living on your computer.
· The screenshot is from the install USB, which gives an error message that says, "An error occurred while updating firmware. Quit the installer to restart your computer and try again." The error when using the Install macOS High Sierra application is similar, saying something more like it could not validate the firmware.
Problem: macOS won't install errors. Perhaps you managed to download Big Sur or any other macOS update and then found that it wouldn't install. This also happened to many people when attempting to ...
If you got this error when installing macOS with an Intel iGPU or Nvidia GPU then it’s likely you have EmuVariableUefi-64.efi in your EFI partition. This driver can cause an issue during the install of High Sierra which can produce the above error and removing it will remove the error. Mount your EFI partition using Clover Configurator
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