How can I downgrade from iOS 26 to iOS 18… – Apple Community

September 18, 2025

Unfortunately, Apple doesn’t allow downgrading to older iOS versions once they’ve stopped signing them. That means you can’t directly downgrade from iOS 26 to iOS 18.5 unless Apple is still signing iOS 18.5 (which is highly unlikely).

https://www.discussions.apple.com/thread/256078060

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