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Connect Oppo N1 to computer
Tap "Storage device"
Open "Removable Disk"
Open "Ringtones"
Drag your ringtone into this folder
Back to "Removable Disk"
Open "Notifications"
Drag your notification sound into this folder
Swipe down from the notifications bar, tap the "Settings" icon
Tap the "Sound" tab
Tap "Ringtone"
Choose the ringtone just put in "ringtones" folder and tap "OK"
Tap "Message tone"
Choose the notification sound just put in "notifications" folder and tap "OK"
Tap "Other notifications"
Choose the notification sound just put in "notifications" folder and tap "OK"