update my iphone 6 plus ios 12.5.7

An iPhone 6 can't be updated beyond 12.5.7, it doesn't have the hardware required to run anything higher.

If you need a higher iOS version, you will have to purchase a newer phone.

• If you have an iPhone 5S or 6/6plus, the highest you can update to is 12.5.7

• If you have an iPhone 6S through 7, or SE 1st generation, you can update to 15.8.3

• If you have an iPhone 8 or X, you can update to 16.7.10

• If you have an iPhone SE (2nd generation or later), or XR through 15, you can update to 17.6. 1

If your iPhone 6 is already running iOS 12.5.7......there are no more updates.

If your iPhone 6 is not running iOS 12.5.7.......make sure that you have a good Wi-Fi connection and fully charged battery.

Tap Settings > General > Software Update