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IPhone4 wants to upgrade, can it be upgraded?

IPhone phone can update the system through computer or mobile phone:

1. computer: Install iTunes software, connect iPhone to computer with data cable, open the software, click "iPhone" button in the upper right corner to enter Apple ID, and click "Check for updates" to download updates.

2. Mobile phone: Click "Settings", then "General", then click on software update, and then click on download and installation to update.