How to Fix Unknown Error 54 on iTunes?
Steps to Fix Unknown Error 54 on iTunes? 
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iTunes contents between the Apple devices can be easily synchronized but sometimes an unknown error 54 comes while performing this action. This error comes mainly when the files on iTunes on your computer is locked and to continue click ok button. However, if sync not started on your Mac computer or other device, then update your iTunes and other essential software updates for your device. And if the problem continues just follow the steps given below to fix unknown error 54 on iTunes.
Try with the smaller size of contents 
A specific file or content creating iTunes sync error 54 can deal by uploading small amount of content. Start sync with limited files and add more content till you see error, and this process will also help to identify the actual content that is causing the error.
Combine all media files into iTunes library 
Actually, all media files located in different folders or drives need to be accumulated at one place. Consolidate all your media files into the iTunes media folder and then run the sync process. iTunes sync support can also help you to unite all your media files together.
Remove and Again Download the Content
If you face the iTunes unknown error 54 again on your computer screen, delete all the contents and redownload all the contents or you can also go directly to your Apple device like iPhone, iPad or iPod to sync without facing any issue.
Disable third-party software stopping sync 
Third-party security software used to protect your computer from cyber threats, also interface with the sync process runs between such devices. Check such software and adjust the security settings to allow uninterrupted sync or disable the security software till you complete the process successfully.
Check and Take out PDF files from the sync 
iTunes sync error also occurs when you try to sync PDF files which is saved on iBook app on your iOS device. The problem also comes when you try to transfer iTunes purchases from your iOS device to your computer. To fix this problem use the share option in iBook on your device to send the PDF file as an email.
Fix Unknown Error 54 on iTunes
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