I can’t update my iPhone 6 to iOS 12 need help
Can’t update to iOS 12
iPhone 6, iOS 11
Can’t update to iOS 12
iPhone 6, iOS 11
Update your iPhone, iPad, or iPod touch
Learn how to update your iPhone, iPad, or iPod touch to the latest version of iOS—wirelessly or using iTunes.
You can update your iPhone, iPad, or iPod touch to the latest version of iOS wirelessly. If you can't see the update on your device, you can update manually using iTunes.
Before you update
Make a backup of your device using iCloud or iTunes.

Update your device wirelessly
If a message says that an update is available, tap Install Now. You can also follow these steps:

If you see an error or need more space when updating wirelessly
If you see an error message while trying to update your device wirelessly, learn what to do. If you need more space for a wireless update, you can update using iTunes or delete content manually from your device. Whether you use iTunes or update wirelessly, you'll have the same amount of free space on your device after you update.
Some iOS software updates aren't available wirelessly. VPN or proxy connections might prevent your device from contacting the iOS update servers.

Update automatically
With iOS 12, you can have your iOS device update automatically. To turn on automatic updates, go to Settings > General > Software Update > Automatic Updates. Your iOS device will automatically update to the latest version of iOS. Some updates might need to be installed manually.

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.

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.
I can’t update my iPhone 6 to iOS 12 need help