Download the ios15.1
I want to download 15.1 oios
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• If you have an iPhone 5S or 6/6plus, the highest you can update to is 12.5.5
• If you have an iPhone 6S or newer, you can update to 14.8.1 or 15.1
Go to Settings > General > Software Update.
Update your iPhone, iPad, or iPod touch -
https://support.apple.com/en-us/HT204204