![]() Do remember that SIP is disabled, so you might consider an anti-malware package in addition to XProtect, if only to run it periodically. Sierra updates just ran fine straight out of the Mac App Store. Once you've done the install, there's nothing at all unusual about running the Mac, save for OS updates on High Sierra, which you have to get the combo updater to effectively do. 4 APFS BootROM Support: If you have a machine that supports High Sierra natively, you MUST ensure you have the latest version of the systems BootROM installed. high sierra runs very well but all the significant OS changes and iOS integrations made me decide to run the Catalina Patcher and that seems to run ok. When the operation completes, boot your target unsupported Mac off the USB drive you just created. That poor Mac currently has High Sierra, Mojave, Catalina and Big Sur installed but I’m only using Catalina and Big Sur. Next, select your USB drive in the Target Volume list, and click Start Operation. NB: #1 and #2 are not optional, and they are not "either/or". Insert your desired USB drive, open Disk Utility, and format it as OS X Extended (Journaled). Open the macOS Sierra Patcher tool, and browse for your copy of the macOS Sierra Installer App.Ensure that the tool successfully verifies the app. If things go wrong, you've got your CCC backup that you can boot from over USB to assist with repairs, or to restore.
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