my Iphone is still 12.5.5 ios, it’s not updated
how can I update my ios 12.5.5 into ios 15?
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Check if your iPhone is compatible with iOS 15.
Identify your iPhone model - Apple Support
iOS 15 and iPadOS 15 are compatible with these devices - Apple Support
If your iPhone is compatible with iOS 15, follow the guidance to update to the latest iOS. Otherwise, the device cannot be updated to iOS 15.
How to update to iOS 15 or iPadOS 15 - Official Apple Support
Links that might be helpful:
About iOS 15 Updates - Apple Support
