Sony recently released un updated version of the firmware for the DSC-RX100 camera. According to Sony, the new firmware, Version 1.10, improves the operation of the autofocus mechanism to reduce noise and vibration during focusing. Here is a link to a page where the updated firmware can be downloaded; instructions for installing it are provided there also.
I have not used this update myself, because I no longer have my RX100 camera. It sounds like a worthwhile upgrade, though.
For general information about the RX100, see the guide book available through this site and from other sellers.
Fujifilm has just released a firmware upgrade to Version 1.10 for the X100S camera. This upgrade tweaks several features of the camera, including the live-view histogram, file naming, numbering of continuous shots, use of the AE Lock button, the RAW Conversion function, and the optical viewfinder. I would not say that any of the changes are earth-shaking, though they appear to be worth having. I haven’t yet had time to update my X100S with the new firmware. Once I have done so, I probably will post a brief discussion of how the upgrade went and how the changed features operate. For now, here is a link to the page with the information from Fujifilm about the upgrade.