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i have a 3g iphone with his last possible OS 4.2.1. After update of this app is not possible use it. How to download and install the old correct version?

PAOLO UBERTAZZI 6 years ago updated by zgx 6 years ago 0
i have a 3g iphone with his last possible OS (4.2.1). After update of this app is not possible use it. How to download and install the old correct version?
Many thanks

Answer

Answer
Read this : http://support.apple.com/kb/ht5919
Answer
Read this : http://support.apple.com/kb/ht5919