One of them will be updating the systems firmware so do make sure your MagSafe adapter is plugged in and give your system time to go though the process. Your system will go though a few reboots doing the install process. Once done download this tool: MacDaddy - Install Disk Creator, it will install the OS installer onto he USB thumb drive so you can boot up under it to do a clean install. Restore Mac OS or Re-install Mac Os Using Internet Recovery for Mac Operating System HOW TO FIX This Item Is Temporarily Unavailable mac book pro imac os x could not be installed on your computer.100 solution How to Restore Missing Finder Sidebar on Mac OS X Mavericks SOLVED - How to Fix macOS Sierra cant be Verified ¦ Corrupted or Damaged. You'll need to run Disk Utility to prep the USB thumb drive with GUID partition map and formatted with Mac OS Extended (Journaled). I would also recommend you first prep up a USB thumb drive (16 GB) so its bootable. But, before you install it (cancel the install process) I would recommend you make a copy. Click on it and download the OS installer. Once you are sure you're ready all you need to do is launch the App Store app there you'll find the macOS Sierra banner at the top of the stores front page. But before you make this jump you should make sure your HD is healthy and has enough free space (as well as the SATA cable) and you have enough RAM in the system. Your system can support the most current: macOS Sierra 10.12.
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