![]() ![]() Then select startup disk to be the drive/volume with the new OS. Create a partition or use an external drive, install the new macOS on it, then migrate from the current install. It's called creating a dual boot system on a Mac. When the install is done, the system is booted using the new BE and if the update broke something the system could be rebooted using the previous BE which does not contain the OS upgrade. Solaris supports a feature called Boot Environments which allows the system to run normally off one one BE while installing a OS update into a new BE. Apple should do something similar to what Solaris (Unix OS) provides for installing OS updates. In general, Apple could/should make rolling back a major macOS update much easier and reliable. When the install is done, the system is booted using the new BE and if the update broke something the system can be rebooted using the previous BE which does not contain the OS upgrade. Solaris supports a feature called Boot Environments which allows the system to run normally off of one BE while installing a OS update into a new BE. When everything looks good running the downgraded macOS, delete the “Install Monterey” app (or whatever the downgrade version of macOS is) in /Applications to save around 13GB of storage.Note, all this can take a long time (5+ hours, or longer, like 20 hours if restoring from a TM server).In particular, all of the folders I was sharing, including a folder used by the TM Server, were no longer shared. Note, after I did the Migration Assistant restore from my TM backup I found a number of things were not set up as they were when I did the TM backup. When that’s done, boot normally, login and run Migration Assistant and restore the more recent TM backup for the level of macOS installed.See: Mac startup key combinations - Apple Support for boot option key combos. ěoot off of the bootable install USB drive.On Monterey it in sysprefs preferences.Įrase your Mac and reset it to factory settings - Apple Support On Ventura this is in the sysprefs->General->Transfer or Reset panel. Run Migration Assistant and see if it lists the backups on the TM backup drive Make sure there’s a recent TM backup using the macOS version I’m downgrading to.Note that searching for “macOS Monterey” in App Store doesn’t work so use this link to get to the macOS download: How to download macOS - Apple Support ![]() How to reinstall macOS - Apple Support How to reinstall macOS Here are some important references:Ĭreate a bootable installer for macOS - Apple Support Creating a bootable install drive Ĝreate a bootable install USB for the macOS level to downgrade toĪpple didn’t make this easy.Here are the steps that got me from Ventura to Monterey: ![]()
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