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I’m planning for the worse IF I decide to upgrade to Sequoia and it all hits the fan and I want to roll back to Sonoma. I already built a bootable Sonoma USB drive to install from. Has anyone done this yet? All of the previous Sonoma upgrades I’ve done had USB Hub issues at one point or another, i.e, not recognizing USB disks, HDMI, etc.
MacBook Pro 16″, macOS 14.7
A word of caution If the computer is Apple Silicon Computer M1.M2, M3
Refer to the detailed instructions posted by @Barney-15E
Downgrade from Sonoma to Ventura / factor… - Apple Community
The same principles and procedure would apply if downgrading from macOS 15 Sequoia to an older version of macOS
Yes, you can then backup, Option-boot from the USB installer, erase, install, restore.
Another option is to clone existing Sonoma to an external volume with Carbon Copy Cloner or Super Duper, and boot to it (Silicon Macs might be picky about that, though). Then upgrade that external test volume to Sequoia and test your mission critical apps, devices and workflows.
Yes, you can downgrade Sequoia to Sonoma with a bootable installer. Remember to back up your Mac in advance to avoid unnecessary data loss.
Roll back to Sonoma from Sequoia using a USB installer
