Download and install an audio-conversion software program. Many software programs are available for free or as shareware online. Although you do not to convert your file to a different format, most commercial audio-conversion software programs can increase the bitrate of an audio file.
Run the audio-conversion software on your computer. Open the file that you want to convert.
Select the desired bitrate, sample rate and file format for the output file. Make sure the settings that you choose are compatible with the desired playback device.
Run the conversion software. When the conversion finishes, test the file in the playback device to ensure that the file is compatible.