[疑難求助] urgent.. help..

anataxia

Anyone can help..

我的iphone jb了。。用了一个多月都没问题，但前几天无端端打game到没有sound了。。是speaker totally没有声音！现在想restore 回 firmware3.1.3 然后送回apple service，但都restore失败？？？出现了这个error “ The iPhone could not be restored。This device isn't eligible for the requested build。