IMPROVEMENTS
1.) Improved auto iris operation 
2.) Corrected errors in 3G-SDI output timecode
3.) Modified white balance memory operation
4.) Correction of the HD SDI Remote operation
5.) Changed the settings retention of assignable switches/buttons
6.) Output settings when the Picture Cache function is enabled
  
Note: This firmware can be updated from V1.06 and V2.03. X500 must not be downgraded to previous versions after updating to V2.04.

Disconnect connected devices (such as USB wireless LAN module (IFU-WLM3), SDI, HDMI, microphone, viewfinder, and lens) and eject any media in the SxS memory card slots before upgrading.