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Have you met the situation that iTunes won't sync to iPhone / iPhone won't sync when you plug them into your computer? And you can't add or delete songs anymore because your devices aren't being recognized by iTunes.
Main Reason about can't sync music to iPhone/iPhone not syncing with iTunes
1. Not the latest version of iTunes
2. Your iPhone is unlocked
3. Your iPhone didn't trust your Mac or Windows PC
4. The damaged USB cable.
5. The USB slot of iPhone and computer are damaged or full of dirt.
In fact, it's hard to say what specific reason causing iPhone won't sync , but you may fix the problem by trying the following methods.
How to fix “can’t sync music to iPhone, iPad, iPod” problems in iOS 9/iOS 10/iOS 11 etc.?
Solution 1. Sync music with iTunes Alternative
Solution 2. Sync again after turning off iCloud Music on your iPhone
Solution 3. Sync after turning off Show Apple Music
Solution 4. Sync Music after turning off iTunes Match on iPhone
Solution 5. Uncheck “Read Only” of iTunes folder (For Windows users)
iOS Manager is one of the best iTunes alternatives that work likes iTunes and can do what iTunes can't. It can sync all your iOS files including music(purchased/downloaded), video, photos, playlists, movies, contacts, messages, podcasts, iTunes U and audio books etc. from one iDevice to iTunes, your PC or any other iDevice.
Key features (Music):
Transfer music between iOS devices and PC/Mac without iTunes
Transfer Media files between iOS devices directly
Manage your iOS devices without iTunes with ease
Fix & optimize songs’ incomplete ID3 information, album cover to iPhone directly.
Automatically convert iOS-unsupported music formats to compatible ones
Intelligently Export exclusive files to iTunes and automatically filter the duplicate files.
Perfectly backup/restore iTunes library.
Fully compatible with iOS 11/10.3/10.2/10.1/10.0/9 etc.
Also Read: How to Restore iTunes Library?
Step 1. Install and launch this software on the PC/MacConnect your iPhone/iPod to the computer via a USB cable, you will see the primary interface as below.
Step 2. Sync files between iPod and iTunes
a. Sync Music from iPhone/iPod to iTunesClick "Media", then you can sync music, movies, podcast, iTunes U, audiobook and music video to your iTunes. Here you can select the files which you want to add to your iTunes, and click "Export" to "Export to iTunes Library".
b. Sync Music from iTunes to iPhone/iPodGo to "ToolBox", and click the button "Transfer iTunes to Device".
Select the playlists which you want to import or the "Entire Library", and tap "Transfer". The playlists and the music files with tag information & album covers will be transferred to your iPoad at the same time.
Tips: This iOS manager also allows you to manage your iOS files and transfer the files between iOS devices and computer without iTunes restrictions.
See more: How to Transfer Music from Computer to iPhone without iTunes?
Step 2. Click iPhone > Setting > Music > Turn off “Show Apple Music”
Step 3. Click Edit in iTunes > Preferences > General > Uncheck “Show Apple Music” > OK
Step 2. Launch iTunes on your PC/Mac and plug in your iPhone, iPad or iPod.
Step 3. Click your device icon at the top of the iTunes window.
Step 4. Select Music in the side navigation panel.
Step 5. Uncheck Sync Music option in the right panel and then click "Apply" or "Sync".
Step 6. Once the sync is complete, recheck the box for Sync Music and hit Apply or Sync again.
Step 7. Unplug your iPhone or iPad and see if your music is back.
Check whether the permission property of your “iTunes” folder or the data you plan to sync is “Read Only”. If you checked “Read Only”, you cannot transfer or edit the file but only read it.