iTunes - Unknown Error 28

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anonymous · Answer 1 · 2016-01-11T18:21:57+0000

These errors may indicate a hardware problem with your device. Follow the procedures in this article and also try to perform a restore by connecting to a computer and to a network that you are sure to isolate the problem to the device.
If the IMEI or MAC address is not specified or corresponds to a default value, this can also confirm that the problem is of a material nature.