Pioneer DJ has made several firmware updates to their Pioneer DJ equipment. Most of the improvements are regarding responsive scratch performance and FX.

DJM-250MK2 Firmware update (Ver.1.05)

Improved

Cut lag length improved for a more responsive scratch performance.

Fixed

Popping noise occurred via USB audio (FX SEND/RETURN) when switching FX assign on rekordbox with BEAT FX enabled.
Fixed other minor issues.

DJM-900NXS2 Firmware update (Ver.2.02)

Improved

Cut lag length improved for a more responsive scratch performance.

Fixed

Popping noise occurred via USB audio (FX SEND/RETURN) when switching FX assign on rekordbox with BEAT FX enabled.
Fixed other minor issues.
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DJM-TOUR1 Firmware update (Ver.2.02)

Improved

Cut lag length improved for a more responsive scratch performance.

Fixed

Popping noise occurred via USB audio (FX SEND/RETURN) when switching FX assign on rekordbox with BEAT FX enabled.
Fixed other minor issues.
Download Update

DJM-450 Firmware update (Ver.1.03)

Improved

Cut lag length improved for a more responsive scratch performance.
Selected channel is shown on the display when switching the effect channel.

Fixed

Popping noise occurred via USB audio (FX SEND/RETURN) when switching FX assign on rekordbox with BEAT FX enabled.
Fixed other minor issues.
Download Update

DJM-750MK2 Firmware update (Ver.1.03)

Fixed

Popping noise occurred via USB audio (FX SEND/RETURN) when switching FX assign on rekordbox with BEAT FX enabled.