Upgrades fix a few annoyances some users have had (The Volume tick issue, and digital muting problem) as well as adding a few extras such as renaming of inputs (T762 has this out of the box) and ability to disable the temporary OSD when one alters volume etc (Can cause noise issues such as the volume tick).
Basically it upgrades to v1.20 of the software (at least on my T752).
I'll be doing a write up tonight probably and it'll be postedon my website:
DIY Hometheatre site
There's just a couple of pics showing version no's at the moment. I'll repost here when I get the full writeup done.