To update the X32 firmware, download the latest firmware update via the X32 product page:
http://www.behringer.com/EN/Products...oftwareContent
Unzip and copy the UPDATE file to the root of a FAT32-formatted USB stick. Insert into the USB slot next to the screen and reboot the console. On rebooting you should see the black boot screen appear before the unit is fully booted.
If this does not occur, you will need to change the sampling rate in the console under SETUP>CONFIG. Confirming will prompt a reboot...