When trying to update or restore your iPhone or iPod touch with iTunes, you may see an error message in iTunes that stops the update or restore process. You may also see the "Connect to iTunes" screen on your iPhone or iPod touch:The error message in iTunes may also include one of the following numbers (but is not limited to): 2, 4, 5, 6, 9, 13, 19, -18, -48, -50, 1002, 1011, 1601, 1602, 1603, 1604, 1608, 1609, 1611, 1612, 2003, 2004, -9808