1) Turn on the power of DJM-2000 while pressing [INST FX NOISE] + [LINK CUE] + [CH2 CUE] to launch it in "Checker mode."
2) "Checker mode" is shown on the LCD of the DJM-2000.
3) Press and hold [MIDI] + [REMIX] + [MIX] over 2 seconds.
4) During the update, "Checker mode USB download start XXXX" will appear on the screen.
5) When the update is completed, "Checker mode USB download end" will be shown there.
6) Once the above message is shown on the screen, cycle the unit. (turn off the power of DJM-2000 and then turn it on again.)
If the problem is not solved even after the above process, please contact Pioneer DJ technical support in your region to have the unit serviced.