Hi Guys, thought I'd share my experience with the upgrade yesterday of my 4ES. Thanks to Sven and Alex for making it easy on the rest of us. I followed the instructions and the upgrade itself went fine. The 4ES displayed "Memory Clearing" in the end and a mesage box on my laptop said "Memory Updated" or something like that. The 4ES was reset to it's factory default settings so I went back and recalibrated the speaker settings, etc. What does the upgrade do or fix? Basically nothing. Well it may have fixed things like multi room, etc. but nothing obvious. It does not remember DPL settings for different inputs, so if I choose DPL-II music for CD and then go to DVD and choose DTS-Cinema Neo and later when I switch back to CD, I am still on DTS-Neo Cinema. Cinema Modes are still in DPL domain and the receiver has not changed in any way with regards to DSP modes, etc. Even EQ setings are not unique to inputs selected. I have 2 distinct EQs I use. EQ1 is for music and EQ2 is for movies. If I have selected EQ1 for CD then EQ1 carries over for all the inputs. I have to physically change the EQ to EQ2 when watching a DVD and change it back to EQ1 when listening to a CD. So in short, I have not seen any benefits for myself currently but the upgrade went smoothly. Hope this will help those with he DA4ES in deciding whether to upgrade or not.