My system is currently at 4.0U with all the modified cIOS (last game I tried was Dead Space Extraction Pal and it worked fine). I have the software to safely update to 4.1U, but haven't so far since I didn't see the need. However, when reading the 4.2 system update thesis 8-) today, someone wrote that 4.1 added WiiMotion+. Well, I have a Motion+ and I assumed it was working just fine for Tiger Woods and NHL 2K10. Do you have to have 4.1 to use all the features of Motion+ games? If there any reason to go from 4.0U to 4.1U? Thanks for any help you can provide in advance.