BenQ JOYBEE P330 - Manual (Page 53)

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Connect the MP3 player to the PC, enter the firmware upgrade interface,
then click the program “MP3 Player Upgrade Tool”.
Click the “Select new firmware file” to select the firmware you need, then
click the “Begin upgrade” button. When the progress end, the upgrade is
successful.
Sound Convert Tool
Select “Sound Convert Tool”, the figure will be shown as below: