How to software Update
How to software Update in Apple 6s
iPhone SE, iOS 13
Question marked as
• 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 through 13, you can update to 15.2.1
Go to Settings > General > Software Update.
Update your iPhone, iPad, or iPod touch -
https://support.apple.com/en-us/HT204204