I just receive a new in the box iPhone 5s and it has iOS version 8.3. I downloaded iPhone_4.0_64bit_10.3.1_14E304_Restore.ipsw and can I install it manually? It want me to install the latest version but I don't because I have a iPhone 4s and after install the latest it seen not to hold a charge anymore.
Can anyone help me?
Can anyone help me?