Why isn’t the latest update showing up on my iPhone 6plus

An iPhone 6 cannot run iOS 13. It is limited to iOS 12.

iPhone 6 is not capable of running the newest iOS 13. iOS 13 requires 2gb of RAM, and iPhone 6 only has 1gb of RAM. iPhone 6 will no longer get iOS updates after getting them for over 5 years. If you want the latest software, you need a newer iPhone.

Schacon_87 wrote:

my niece has the same iPhone 6 Plus and hers was able to update the newest update.

That is not possible.

One of these explains what happened:

• She does not have an iPhone 6 or 6 plus. She actually has a later model.
• Her “latest version” is not iOS 13.
• She has a jailbroken or otherwise improperly tampered iPhone.

No. If she was able to get iOS 13, she has to have iPhone 6s, which looks identical to iPhone 6.