Hi,

There is an upgrade for the firmware available at:

http://www.sony-asia.com/support/download/product/bdp-s300/modelfirst

This upgrades the firmware to level 4.4.

When I checked my machine delivered Nov 07, it was at version 2.2.

This version of the firmware is only for Asia Pacific machines, but other Sony sites should have appropriate versions for their regions.

The main reason for upgrading is to ensure compatibility with later Bluray discs, but the funny thing is that since installing, the sound on DTS-HD off Blu-ray seems a lot better to me. This could be imagination but I don't think so. The upgrade is well worth it in my opinon for the sound improvements (if they exist!).

The upgrade process is straightforward, download a file to PC, unzip an ISO, burn to CD (needs a utility that can burn ISO images), load the disc into the player.