How can I upgrade my iPhone 6s
how can I upgrade my iPhone 6s to highest version
iPhone 8
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• If you have an iPhone 5S or 6/6plus, the highest you can update to is 12.5.4
• If you have an iPhone 6S or newer, you can update to 14.7.1
Update your iPhone, iPad, or iPod touch -
https://support.apple.com/en-us/HT204204