Step-by-step Guide: How to convert M4A to MP3 as BlackBerry ringtone
First, you should download BlackBerry Ringtone Maker to a known location, install it correctly and then enter the interface of blackBerry ringtone maker.
Step 2, Choose M4A files to convert.
Click the "Browse" button to select the wanted M4A files, pre-listen them and set start time and end time to choose the clips of M4A files you like to convert to MP3 as BlackBerry ringtone.

Tips:If you want to set the start time and end time to choose clips to convert M4A to BlackBerry Ringtone MP3, you should adjust the blue sliders to control.

Then you can choose which folder of PC you want to store MP3 ringtone converted from M4A files before transferring to BlackBerry.
Step3.Start convert M4A to MP3 as BlackBerry ringtone
Click the "Start" button to start converting M4A to MP3 as BlackBerry ringtone and BlackBerry Ringtone Maker will convert it automatically.
Then you can transfer M4A to BlackBerry ringtone MP3.
Tips: When you transfer M4A to BlackBerry ringtone MP3, you should install BlackBerry Desktop Manager on your PC , which can make your BlackBerry phone sync with PC, and then connect BlackBerry to your PC, BlackBerry Ringtone Maker will tM4Ansfer MP3 ringtone converted from M4A to BlackBerry directly.