The specific operation steps of Apple mobile phone connecting to the computer for system upgrade are as follows:
1. First connect your phone to your computer, and then open the iTunes software on your computer:
2. After opening the software, the main interface of the phone will be displayed, and the system version of the phone will be displayed on the right side of the software, and then click the check update below:
3. Then, download the latest IOS system. Here is the system firmware of iPhone 6. At this time, the latest system is 11.2.5. Click the download button:
4. After downloading the firmware, directly click the Restore iPhone option in the iTunes software:
5. Finally, a dialog box appears and click OK, so that the computer will automatically upgrade the system for the iPhone: