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iPhone sync error 50 (or -50) can occur when you try to update or restore your iPhone with iTunes. The update or restore process ends when the “Error 50” or “Error -50” message is displayed. The first step to troubleshoot the iPhone sync error 50 is to update iTunes. On a Mac, go to iTunes, and click ‘Check for Updates’. If any updates are available, download and install them. For iTunes installed on a Windows-based PC, go to iTunes Help and click ‘Check for Updates’. If this doesn’t resolve the issue, the error could have been caused by a wrong USB connection or third party software conflicts.
Follow the steps given below to fix the iPhone sync error 50 (or -50):
USB troubleshooting
Note: “Error (-50)” may also be displayed when timeout occurs while trying to access the iTunes Store. To fix this, temporarily disable iTunes Store through the Parental Controls option in iTunes.