Unable to update iPhone from iOS 15.6.1 to 18.7

Use a computer to update your software. First remove the downloaded update on the iPhone by going to Settings > General > iPhone Storage, find the update and tap on it and choose Delete. Then follow the instructions you for installing with a computer. If you do not have one, then borrow one or go to the Apple Store.

1-- Make sure you have one of the following:

• • A Mac with a USB port and OS X 10.9 or later
  • A Windows device with a USB port and Windows 7 or later

2-- Do one of the following:

• • Connect your device to your computer using the included Lightning to USB Cable. If your computer has a USB-C port, use a USB-C to USB Adapter or a USB-C to Lightning Cable (each sold separately).
  • If your device came with a USB-C to Lightning Cable and your computer has a USB port, use a Lightning to USB Cable (sold separately).
  • If your iPad came with a USB-C Charge Cable and your computer has a USB port, use a USB-C to USB Adapter and a USB-A cable (each sold separately).
  • If your iPad came with a Thunderbolt 4/USB-4 charging cable and your computer has a USB port, use a USB-C to USB Adapter and a USB-A cable (each sold separately). You can use Thunderbolt or USB cables with Thunderbolt devices like iPad Pro 12.9-inch (5th generation) and iPad Pro 11-inch (3rd generation).

3-- After you’ve successfully connected your device to your computer, do one of the following:

• In the Finder sidebar on your Mac: Select your device, then click General at the top of the window.
• To use the Finder to update your device to iOS 15 or iPadOS 15, you must have macOS 10.15 or later. With earlier versions of macOS, use iTunes to update your device.
• In the iTunes app on your Windows device: Click the iPhone button near the top left of the iTunes window, then click Summary.

4-- Click Check for Update.

5-- To install an available update, click Update.

Ios 18.0

vithursan18 wrote:

Ios 18.0

Writing an effective Apple Support Communities question – Apple Community