Can not install IOS 15.1. Please help!
I have an Iphone 6S that I didn't use for 3 years. Now when I want to update it to IOS 15.1 It says that error happens . I tried many times. What shall I do?
iPhone 6s, iOS 12
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If you're sure that iPhone is a model 6s (not a model 6, which can't support iOS past 12.5.5 version), AND if it is still running iOS 12 as you wrote, I suggest that you update it via computer (not wirelessly, via Wifi).
Learn how to update your device manually if you're using a Mac with macOS Catalina or later, or if you're using a Mac with macOS Mojave or earlier or a Windows PC.
If you still get no help, contact Apple Support directly, using this link:--> Get Support
Regards
Giulio
