Didn't we just deal with the exact same scenario not a few days ago with baptx? Well... If you have been out of the loop as you say... Pr 1.1 being the last thing you used ... Then you are pretty out of the loop...
You won't get updates from 1.1 As Maemish mentioned.. You need to reflash 1.3.1 and install cssu.
As well... Maemish ...your instructions are grand. don't delete them. If anything... If we get any more folks showing up asking the exact same question... You need not write anything. Just post the link to your post as answer... It would save a lot of typing .