gaqscene.blogg.se - How to reformat macbook pro high sierra

That was solved by resetting the system clock, see: Installing MacOSX when the installer says: OS X could not be installed on your computer. Run this tool.Īn issue that arose during those machinations is that after running the installation I got a screen saying macOS could not be installed on your computer. You'll find a window that can launch a Post-Install Tool that applies patches.

After installation, boot again off the installer drive.

If desired you can use that window to launch Disk Utility to reformat the hard drive.

Notice there is an extra window on the screen.

Perform an installation using the installer.

Boot off the installer USB drive as normal for a macOS installation.

Click the START button - this builds the installer drive, and applies the necessary patches.

Execute the Patcher tool, and perform these steps.

Download the macOS High Sierra Installer using the Apple App Store.

MacOS High Sierra Patcher Tool for Unsupported Macs As the name suggests, it an application which patches a macOS High Sierra installer to allow installing High Sierra on an unsupported Mac.Ĭlick through to that link, and you'll find a complete set of instructions. I don't know what " Reason: Mac-F2268AC8" means, but the other message clearly means the mid-2009 MacBook Pro is not supported by macOS High Sierra.īy coincidence I had watched a video yesterday concerning the īooting that way showed the above screen, telling me " This version of Mac OS X is not supported on this platform!" None of that resetting made any changes - the macOS High Sierra installer still failed to start in a strange way.Īfter some additional searching I found a suggestion to boot by using Command+S.

A complete reset is performed by unplugging the battery pack, the power supply, and then holding down the power button for awhile, presumably to drain off any held energy in capacitors. Initially the suggestions I found said to reset the NVRAM, the PRAM or the SMC, and even to do a complete reset of the computer. The Apple support knowledge base, the Prohibitory Symbol is shown when "your Mac couldn't find a valid System Folder to start up from." This didn't make sense since the installer USB drive does have a System folder. Instead - the computer showed a grey screen with this symbol: Normally booting off the installer this way launches the installation program, and we would then proceed with the installation. The initial behavior was - insert the USB drive holding the macOS Installer in the USB port, reboot the computer, hold down the Option key, and select the installer drive.

Getting to see that message took some digging.