Macs that use the Broadcom BCM4321 Wi-Fi module will not have functional Wi-Fi when running High Sierra. The same applies in this case, too, since the macOS High Sierra Patcher will render your iMac 8.1 Broadcom Wi-Fi chip useless for certain models. The Reason Not To Install macOS High Sierra on an Unsupported MacĪs you may have already experienced with other types of officially unsupported machines, the probability of having issues is much higher. Click the “Patch” button, and after the process has finished, click “Reboot”.This step is important, because it contains the optimal patch for that specific model. From the options, select the Mac model you own.Install macOS normally, reboot back on the installer drive, and then open the “macOS Post Install” application.Boot from the USB drive by holding down the option key after reboot.Open the macOS High Sierra Patcher tool, navigate to the High Sierra Installer App, then select your pen drive and click “Start Operation”.Format a USB drive as Mac OS Extended (Journaled) via Disk Utility. While there is a full step-by-step tutorial and video tutorial available on DOSDude1's website, it’s good to get a summary of the basics, which start with downloading the macOS High Sierra Installer app from the Mac App Store: Also, a backup of your data is always a good idea in case anything goes wrong. Installing the operating system on any of these Macs will require some technical knowledge, so it is not recommended for novice users. But remember, with High Sierra you will also migrate to the Apple File System, and it is highly recommended that you first disable SIP because it may prevent the patch from working at all. If you happen to own any of the Penryn Macs mentioned above, the macOS High Sierra Patch Tool written by DOSDude1 will make running the latest software possible.
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