08-28-2013 08:28 AM
Welcome to BlackBerry Support Forum!
Well, firstly why do you want to downgrade to a 9720 from a Q10?
9720 will not support the backup file. You need to use outlook or othe 3rd party backup apps which are available for q10 & 9720.
PS: dont switch
09-19-2013 11:22 PM