IOS update
I need software update why not working updates
iPhone 6s, iOS 13
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See Update your iPhone, iPad, or iPod touch https://support.apple.com/en-us/HT204204 and the related compatibility guide below.
iOS 13 and iPadOS are compatible with these devices - Apple Support. Your phone fits in here and allows the latest version of iOs 13.
And, since you are having an update problem, see:
If you see an error when you update or restore your iPhone, iPad, or iPod https://support.apple.com/en-us/HT201210 and
iOS update and restore errors https://support.apple.com/en-us/HT204770