A simple tip to assign ringtones to contacts:
Play a MP3 and with menu button set as (temporary) default ringtone.
Then in contacts assign the ringtone from the default drop down menu to the contact. By stting is as default ringtone it will be selectable there.
After that assign the previous ringtone again (if necessary with procedure above).
Play a MP3 and with menu button set as (temporary) default ringtone.
Then in contacts assign the ringtone from the default drop down menu to the contact. By stting is as default ringtone it will be selectable there.
After that assign the previous ringtone again (if necessary with procedure above).