How to update iPhone 6s Plus to the latest iOS?
How to update 6S plus latest version Software
[Re-Titled by Moderator]
iPhone 6s Plus, iOS 14
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The final version of iOS for iPhone 6s is iOS 15.
Here is how to: Update your iPhone or iPad - Apple Support
Remove any add-on VPN client apps, connect to Wi-Fi or to a Mac or Windows PC, and update.