iPhone 6s shows ,,Device unknown''
i have an iPhone 6s, which shows ,,Device unknown'' after selecting language and country . I can not activate it.
If it powers on, it takes about 3 min, until the apple logo dissapears and until i can choose the language.
iTunes does not recognize the iPhone, no matter if i try to put it in recovery or DFU mode.
iTunes and the iPhone has the actual software. I also tried to change the battery, but it didn't help.
Thanks in advance for your help.
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