rekordbox froze when I failed to update the DJM-250MK2 firmware.

If the update does not complete normally due to troubles such as the USB cable being disconnected or the computer being shut down during updating, the DJM-250MK2 can only be started in update mode(MASTER LEVEL METER of the DJM-250MK2 blinks).
In this case, please download the firmware updater from our support site and update it again.

Steps
(1) Close rekordbox.
　Windows:
1. Press [Ctrl]+[Alt]+[Delete] and click [Task Manager].
2. Click [Processes] tub in Task Manager.
3. Window10 and 8.1: Click "rekordbox program file" and [End task].
　 Window7: Click "rekordbox.exe" and [End process].
→ rekordbox closes.
4. Click [X] button in Task Manager to close it.

　Mac:
1. Press [command]+[option]+[esc] and click "rekordbox" in "Force Quit Applications" window.
2. Click [Force Quit].
3. ["Do you want to force "rekordbox" to quit?] message appears. Click [Force Quit].
→rekordbox closes.
4. Click [X] button in "Force Quit Applications" window to close it.

(2) Turn off the power of the DJM-250MK2, then turn it on again.
(3) Download the DJM-250MK2 firmware update program at this page and update it again.
(4) Launch rekordbox.