Pro DJ Equipment
Dear CDJ-900 Customer
* If the firmware version is Ver.4.10 or later, it is not necessary to update the firmware version.
When you use CDJ-2000/900 2 more pieces, please do not use CDJ with other firmware version together.
How to determine if your CDJ-900 requires the firmware update.
Firmware Update Release Notes.
Ver.4.05 -> Ver.4.10 (16 January, 2012 Update)
* Improved sound quality and stability when playing with MASTER TEMPO on.
Please find past change history here.