You can directly view Messages from iTunes backups using 3uTools. If you want to restore Messages from iTunes backups, just click Restore Data.
3uTools can't help you restore Message separately.
Step 1: Download and install the latest 3uTools on PC. Launch 3uTools and connect your iDevice to PC using the USB cable. Click Toolbox after connection.
Step 2: Click Backup / Restore -> Backups Management.
Step 3: Select the backups you want to view and click View Now.
If you can not find the backups you need, please click Add Backups.
Step 4: If you want to view the Message from iTunes backups, click Messages -> sms.db.
Step 5: As shown below, you can view all iMessages now. If you want to view more details of your Messages, please continue to click Contacts.
Step 6: Two formats are supported (3uTools format & PDF format).
In addition, you can not restore iDevice’s Message separately using 3uTools Restore, but if you want to restore them please click Restore Data.