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I have available an iPhone 4 with iOS 7.1.2 if you think it can help?

I am not entirely sure as I have not tested it on this iOS. Send an email and Apple will send you the app then you can verify ;)

sent email. I asked if you think I can help you by testing on this device. If you need me to test it on this device. That's what I asked.

Apple should sent you the app. Thanks for testing :)