Tip:
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Double click your device in Windows Explorer
Open "Phone/Ringtones" folder
Drag/Copy and Paste your ringtones into the folder
Open "Phone/Notifications" folder
Drag/Copy and Paste your notification sound into the folder
Press Menu button then choose "Settings"
Press "Sound"
Press "Device ringtone"
Choose the ringtone you just put into the "Phone/Ringtones" folder then press "OK"
Press "Default notifications"
Choose the notification sound you just put into the "Phone/Notifications" folder then press "OK"