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macOS Downgrade Guide

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About macOS Sequoia: macOS Sequoia arrived on Macs in September 2024
Users may need to revert to previous versions after updates
Major updates should be waited a few days or weeks
Downgrade Methods: With backup: restore from Time Machine backup, losing new data
Without backup: perform clean install using external drive
Time Machine backup not recommended as it backs up current version
Installation Process: Download and create bootable installer from App Store
Boot from external drive in Recovery Mode
Install older macOS version and set up as new
Recover backed-up files after setup
Preparation Tips: Export documents in standard formats
Take screenshots of settings and preferences
Synchronize cloud storage and email services
Backup app installers and license codes
Troubleshooting: Older Macs may need complete system wipe
T2 Macs require enabling external boot
Recovery mode may work for some older Macs
Some users may need to reinstall original macOS version