It means that there is a problem with Apple's server. Wait it out.
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iTunes error code 4550 is an error that occurs when trying to burn music to a CD. One common fix is to try burning onto a different CD.
Your ispw download is corrupt redownload the firmware.
Update Mac OS from the apple icon in the top left corner of your screen, then go into iTunes and update available Apps. From the iTunes menu bar select Store and then turn Off and then On Genius. If not repaired, reinstall iTunes.
This is an library sync error download i fun box from ifun box blog and open ur cell raw file system will appear open it var file will appear click it then mobile then media delete itunes folder in it and open ur itunes u create ur mobile as new one it continous ur sync as normal
If you get an iTunes error that says -42110, you should go into your iTunes folder and either delete or rename your SC Info folder. The error message usually happens after transferring your iTunes library from one computer to another.