Firmware update for the Sony RX100m3/4/5 cameras

Sony issued a firmware update for three generation RX100 cameras:

RX100m5: Download here
RX100m4: Download here
RX100m3: Download here

Those are the improvements:

• Improves operability with the MPK-URX100A Underwater Housing:
  1. Adds the Underwater Auto feature in the White Balance settings
  2. Adds the Flash Off mode when the Flash unit is popped-up
• Improves the overall stability of the camera