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Originally Posted by peaceridge
Thanks, I needed to know that piece. Could I restore from ios 18 backup to an ios26 device and get back to ios 18 on the device?
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Sorry, it's a one-way trip from iOS 18 to iOS 26. There's no available IPSW for iOS 18.7.1 so even if it's still being signed, you can't downgrade via iTunes.
Also, once the backup has been changed to iOS 26, it can no longer be restored to older iOS versions. You would need an archived iOS 18 backup (e.g. via Finder or iTunes) to be able to restore to 18.