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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 il y a 6 ans mis à jour par zgx il y a 6 ans 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

Solution

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