Iphone 4 Activation error

Hi, I apologize in advance for my bad English but, being Italian I can not help it, some days I found a problem in the activation of my iphone 4, after a restore in DFU, during the activation process, choose the language and arrived activation asks me to connect to itunes without giving me a chance to activate it via wifi, the wifi is not even detected, connect to itunes and it returns the error: (iphone can not be activated because it is an unknown error occurred 0XE8000004 ), I have tried different cables, and I reinstalled itunes several times, I even hordinato a new wifi antenna, thinking that maybe this problem depends on the wifi absent, while I await the new arrivals antenna I decided to ask for help in this comunity, each advice and information is appreciated, thank you in advance, greetings.