Update iPhone 6 to iOS 12

What help do you need?

Are you trying to update the iOS?

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

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

Update iOS on iPhone - Apple Support

Hello ~ Please explain in technical detail what you need help with? Are you trying to update your iPhone? You can only up to iOS 12.5.7 but no further. Take a look by clicking on the links below…

Update your iPhone or iPad - Apple Support

If your iPhone or iPad won't update - Apple Support

~Katana-San~

If you don't have WiFi, then you will need to update using a computer. If you're low on storage space, then using a computer will help as well since updating using a computer requires less storage space on the phone. Follow the instructions I posted on how to update using a computer.

This is not a chat service, and is not a way to communicate directly with Apple; it is a user-to-user technical support forum. If you have a question or issue that you think another user can help you with please describe it in as much detail as you can and a user who sees your request and thinks they can help will answer, but that might not be immediate; it could be hours later. Here is some advice on how to do that effectively→Writing an effective Apple Support Communities post.

If you want to contact Apple use the Support link at the very top of this page or call Apple by choosing a number from this list→Contact Apple for support and service - Apple Support