Originally Posted by sdyu

Actually, there're many android data transfer apps could transfer data between android device and computer. including text messages, contacts, photos.

i happen to know one really works great, have a try

Transfer Audio Files from a Windows Computer:

1. Establish a USB Connection between the Lenovo K4 Note and computer
2. On the home screen, drag the “Status” bar down and make sure “Media device (MTP)” is selected
3. Open the File Explorer on the PC
4. Locate the audio files you want to use for ringtones / notifications
5. Copy the files and transfer them on the phone storage, in the “Ringtones” / “Notification” / “Alarms” directories
6. After the transfer is complete, eject the phone storage from the system tray
7. Safely disconnect the Lenovo K4 Note from the USB cord

Change the General Ringtone:

1. Tap “Apps” on the home screen
2. Go to “Settings”
3. Scroll to “Device” and tap “Sound”
4. Scroll to “Call ringtone & vibrate”
5. Tap “Phone ringtone” and select the ringtone you want to use
6. Tap “OK”
7. Optionally, you can turn “Also vibrate for calls” On or Off

Change the Ringtone of a Specific Contact:

NOTE: You can’t set custom ringtones for contacts located on the phone’s internal memory or the SIM card.

1. Open “Contacts”
2. Select the desired contact
3. Tap “Edit” > “Menu”
4. Tap “Set ringtone”
5. Select the desired ringtone and tap “OK” to confirm

Change the Notification Sound:

1. Access the “Settings” menu
2. Scroll to “Device” and tap “Sound & Notification”
3. Under “Sound”, tap “Default Notification Sound”
4. Select the desired notification sound
5. Tap “OK” to confirm