My iPhone 6s can’t update to the iOS 12

Start out with these steps: Get help with over-the-air iOS updates
If you have a computer available, you can also update using iTunes: Update your iPhone, iPad, or iPod touch

Update your device using iTunes

If you can’t update wirelessly on your iOS device, you can update manually using iTunes on a computer that you trust. If your computer is using Personal Hotspot on the iOS device that you’re updating, connect your computer to a different Wi-Fi or Ethernet network before you update.

1. Install the latest version of iTunes on your computer.
2. Connect your device to your computer.
3. Open iTunes and select your device.
4. Click Summary, then click Check for Update.
   
5. Click Download and Update.
6. If asked, enter your passcode. If you don't know your passcode, learn what to do.

If you see error messages in iTunes or need more space to update

Get help if you see error messages while updating your device with iTunes. Or if you need more space for an update, you can delete content from your device manually.

Hi,

I have iPhone 6s running on iOs 9...

Tried to update using iphone, however it does not allow me to do update using wifi and request me to connect it to my itunes

Then, tried to update using my mac, but it prompts me to install OS X 10.11.4 (or later).

I checked my mac and it is now running on OS X Yosemite Version 10.10.5

I tried to do software update on my mac, but it shows me that NO UPDATES Available

Any idea how to solve this?

Thanks

I have an Iphone 5S running on iOS 9.3.2 and I also cannot update it.

Every time I press the "Update" button in Itunes it either dosen't do anything or it opens up a dialogue box that closes after a few seconds.

Updating through the phone also dosen't work, it promps me to update through the computer.

I think this is issue has to do with the fact that we are trying to update from iOS 9.

It seems apple would like to slowly and quietly make all of its loyal customers go away by constantly messing every update up with no technical support, ive tried talking to people at a genius bar about this too and they had no solution, apple makes me sick

Please have tried for several times my iPhone 6s can’t update it show estimating time remaining have checked the back but still any help. Thank you