Can I update to 6.1.2 not 6.1.3? (URGENT)?

My friend has ios 4.3.3, so he wanted me to update his iphone 4 to 6.1.2 and not 6.1.3. And he is giving me his iphone tomorrow… I agreed and downloaded 6.1.2 firmware but what i'm not sure about that when i press restore and select the firmware will it proceed or it must be the latest firmware only? Please answer

When you update you can only update to the latest one. Just tell him you can't.

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