How to update the iOS of iPhone 7plus linking the computer enforce?

Hello 無法設置郵件已按官網指示,

Welcome to Apple Support Communities!

We want to help get your iPhone updated to the latest available version.

Use these steps to update:

"Update your iPhone or iPad wirelessly

1. Back up your device using iCloud or your computer.
2. Plug your device into power and connect to the internet with Wi-Fi.
3. Go to Settings > General, then tap Software Update.
4. If you see more than one software update option available, choose the one that you want to install.
5. Tap Install Now. If you see Download and Install instead, tap it to download the update, enter your passcode, then tap Install Now. If you don't know your passcode, learn what to do."

This Apple Support page can help get those updates installed: Update your iPhone, iPad, or iPod touch - Apple Support

We hope this helps to update your iPhone 7 and resolve the issue.

Cheers!