I've tried creating a bootable installer following this advice ( ) and that has failed as well. I tried to rest the disc to APFS but APFS isn't even offered as a choice. Try running this application again." Running things "again" also fails. The reinstall takes 6 minutes and then fails displaying "An error occurred while preparing the installation. A restart, after what appears to be a Recovery window and a "Network Installation" process, brings me to the menu of four items which includes Disc Utility and "Reinstall MacOS" which appears to be High Sierra. Connect the USB flash drive to an open USB port on a computer that can read the Windows 7 installation DVD or has the installation files stored on its hard drive already. Nmap binaries for Apple macOS (x86-64) are distributed as a disk image file containing an installer. I "Erased" the drive and reset it to MacOS Extended (Journaled). But in what is probably a misguided attempt to downgrade the system to HighSierra (to make it compatible with Steam for my 14 year old), i've been unable to reinstall the OS. It was running Ventura and doing just fine. Thus, you can consider taking its backup if you dont want to lose it. (He replaced the internal drive with a Samsung SSD 870EVO 500GB there's also a small Fusion Drive - not sure if the drive sitch is relevant). Chances are that your existing data on Mac might be deleted after the reinstallation. I'm trying to reinstall MacOS on a 2017 iMac that a friend just gave me.
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