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Download the most recent Firmware version from the following link; 

https://www.behringer.com/Categories/Behringer/Computer-Audio/Desktop-Controllers/X-TOUCH-ONE/p/P0CAP/Downloads#googtrans(en|en)

Once downloaded, follow these steps;

1. Press and hold the small CHANNEL REC button (at the upper right corner) during power-up

2. Display will show "UP" (unit is now in "firmware UPDATE mode")

3. Open your MIDI Dump software (e.g. "MIDI-OX" on a Windows computer)

4. Select the firmware file for updating (file name ends with ".syx")

5. Dump the file via USB to the X-TOUCH ONE

6. The 7-segment display will show progress

7. The unit will show "donE" when finished

8. Now power off / on again

9. Display will show the firmware version, shortly, while booting