How to update my iPhone 6 Plus to iOS 13?

You have to get a new phone. If the iPhone 6 Plus is the device you are trying to update it CAN NOT be updated to iOS 13 or newer. There is nothing Apple or anyone else can do to help you do it. It’s not an option.

h417- wrote:

Please update my phone iso 13

Unfortunately, the iPhone 6 Plus is not compatible with iOS 13 or higher.

It can be updated to 12.5.7, no further.

The iPhone 6 Plus is too old to be able to run newer iOS versions.

iOS 12.5.7 is as far as the iPhone 6 Plus can go.

If you want to run newer iOS versions, you need a new phone.