Comentário oficial
You did not mention that you've set the DDJ-RB in update mode, so I presume you forgot this?
Before running the program you should set the DDJ-RB in update mode: Press and hold the USB cable while pressing the SHIFT button and the SYNC button on the left deck. If the update mode is activated, MASTER CUE led flashes.
When the master cue led flashed, continue with running the update program.
This is described on page 4 of the update instructions.