How to update my iPhone 6

Did you read the links I posted?

iOS 13 is compatible with these devices

iOS 13

• iPhone 11, iPhone 11 Pro, and iPhone 11 Pro Max
• iPhone XS and iPhone XS Max
• iPhone XR
• iPhone X
• iPhone 8 and iPhone 8 Plus
• iPhone 7 and iPhone 7 Plus
• iPhone 6s and iPhone 6s Plus
• iPhone SE
• iPod touch (7th generation)

iOS 13 and iPadOS are compatible with these devices - Apple Support

Update your iOS device

Get help with over-the-air iOS updates

Update – Can’t or can’t restore