A lot of the time when an iPhone won't connect to iTunes, there's a software problem preventing your iPhone from connecting to your Mac, such as a corrupt file. By reseting the files in the lockdown folder, we may fix the problem by deleting the file that has become corrupted.
How Do I Reset The iTunes Lockdown Folder?
- Quit iTunes on your Mac.
- Disconnect all iOS devices currently connected to your Mac.
- Open Finder on your Mac.
- In the Finder menu at the top your Mac's screen, click Go.
- In the Go submenu, click Go To Folder…
- Type (or copy and paste)
/private/var/db/lockdown/into the box under Go to the folder:
- Click Go.
- Delete all of the files inside the lockdown folder.
- After all the files have been deleted, reconnect your iOS device to iTunes.
- Make sure you Trust your Mac when you sync your iPhone to iTunes once again.
If you don't have permission to access the lockdown folder, follow the steps below.
- Go to the lockdown folder and click on it with two fingers on your Mac's trackpad (right-clicking with a mouse).
- Click Get Info.
- In the bottom right-hand corner of the Get Info menu, click on the lock and enter your admin password.
- Underneath Sharing & Permissions, change the privilege of of everyone to Read & Write.