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iPadOS - Wikipedia
iPad (1st generation) - Wikipedia
iPadOS version by device - iOS Ref
iOS version by device — iOS Ref
iPadOS 18 - Apple
iPadOS version history - Wikipedia
About iPadOS 17 Updates - Apple Support
iPadOS 15 is available today - Apple
iPadOS 16 is available today - Apple
About iPadOS 15 Updates - Apple Support