To display the firmware version and model number on the: Turn on the power. Press the Enter and Surround buttons simultaneously. "Menu Expand" is displayed for the 3ES, 5ES, & VA555ES, or "Menu Specialised" is displayed for the 4ES, 7ES, & VA333ES. In the new menu, press > repeatedly until it displays the model and firmware version. The display is formatted like this: "D4ES U_CA VX.XX" where X.XX is the firmware version, U_CA is the destination code (USA and Canada).
I found that on agoraquest.com which is a Sony enthusiast site. Try searching there. When you upgrade it will reset all of your settings to the default. I have been looking for a list of what the upgrades do since my DA4ES was at 1.00 when I changed it.
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