A firmware update for the DDJ-FLX4 is now available.
This update includes the following change.

[FIXED]

• Fixed an issue in the knob center-position adjustment feature in Utility mode where adjustment would sometimes fail, even when knobs are in the center position.
  Please note:
  In ver. 1.05, a knob center-position adjustment feature was added to Utility mode.
  For details, see the Knob Center Position Adjustment Guidelines.