Оригинальный сообщение: Ben ,
First lets try using [http://www.3u.com/|3UTools] if you have a windows computer once you have that downloaded and install open 3UTools and plug the iPhone to the computer. It’ll then tell you which mode the iPhone is in. It is most likely in DFU / Recovery mode. As this is a phone picked off on gumtree there’s nothing to lose so try doing a restore you can also do this via iTunes as well and see how it goes.