I am guessing you are using windows. also is the phone unlocked? you need to make sure you have the latest version of itunes installed and the correct drivers for your machine. also if youhave any antivirus software running you might want to turn that off too. if the phone is working correctly and all above has been tried your phone might have a hard ware issue
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Please refer to the following link:
How to Fix Unknown Error (-54) about iPhone/iPad/iPod Cannot Be Synced
Sometimes fixing your iTunes sync error (-54) seems a little difficult because it is hard to find which files cause this problem. In this case, you have to sync separately to find what kind of data you can't sync. For example, you can sync only songs to iPhone 6 or iPhone 7 to check whether the music files cause this unknown error (-54).
Of course, there are some common tips you can try to fix this error:
Update your iTunes to latest version, now the latest version is iTunes 12.6.2.
Upgrade iPhone/iPad/iPod touch to latest iOS operating system. Now you can update to iOS 10.3.3. (The iOS 11 will come out soon, you can update to it when it is available.)
Authorize computer in iTunes.Open iTunes > Choose "Store" on iTunes menu and authorize your computer.
Change permissions of your "iTunes" folder or original files/folder.
You can find the originals that you want to transfer to iOS device and change permission. iMore give us one example to change "Read Only" permission of "iTunes folder" to fix iTunes sync error (-54) on Window 10:
Open Windows Explorer > Go to "Music" folder > Right Click "iTunes" folder > Properties > Uncheck "Read Only".
Run iTunes in administrative mode.
Sign in to Windows as an administrator > Right click iTunes icon > Select "Properties" > Select "Compatibility" > Check to run as administrator.
(For Windows iTunes users) Install all available Windows update service packs. iTunes sync error may be caused by incompatible driver on your windows pc.
Use an iTunes alternative
After trying solutions mentioned, if your iPhone still cannot be synced due to unknown error occurred (-54), you can try some iTunes alternative, like AnyTrans. As one of the best iTunes alternatives, AnyTrans allows you to transfer media files (like Music, Playlists, Movies, TV Shows, Podcasts, iTunes U, Audiobooks, Voice Memos, Apps, Ringtones, etc.), and won't erase the existing data on your iPhone iPad. Click Here to Download AnyTrans >
I was having a similar problem. I kept getting a "device timed out" or a "disk cannot be found" error when syncing.
However, when I repaired my disk permissions, all problems (and weird iTunes crashes) went away and I was able to sync everything: photos, music, contacts, calendar, etc.
1) To repair disk permissions (on a mac) go to: Applications-->Utilities-->Disk Utility
2) Select your hard drive in the left pane
3) Click "repair disk permissions"
And just in case you may have any issues with the syncing of data from Outlook 2003, Apple has provided a support link should you run into any issue during your sync process with your iPhone to either computers due to a possible error with the .PST file.
Just load your iTune library with items with you wants to sync. The connect your iphone & click on Sync button on iphone. Then syncing will start. If you enabled automatic syncing then your iphone will automatically sync while you connects to iTune.
( Note: Do not disonnect your iphone while syncing in progress it will reason for data loss.)
I had the same problem. I hooked my phone back up to iTunes and synced my phone. Ringtone disappeared from phone, but remained in my computer's iTunes. Then I added it back to my phone through iTunes by syncing ringtones specifically. Here is step by step:
1. Plug in iPhone
2. Sync Phone
3. Click on iPhone, open Ringtones tab
4. Check "Sync ringtones" box and Select your Ringtone
5. Click Sync
This worked for my phone. Hope it helps. I used my phone to download ringtone.