i phone 6 plus

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

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

To update to 12.5.7 -

Go to Settings > General > Software Update.

This link will show you how to update your iPhone, iPad, or iPod touch using WiFi -

Update your iPhone or iPad - Apple Support Update your iPhone or iPad - Apple Support

This link will show you how to update using your computer -

Update iOS on iPhone - Apple Support Update iOS on iPhone - Apple Support

What about your iPhone 6 Plus? Please ask a question that you may have.

Axel F.

leak224 Said:

"iPhone 6plus"

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So, what's your question?

Learn about this device here: iPhone 6s Plus - Technical Specifications