I'm new to BB. Here is my story, I got my 8320 about three days ago, then I found the new OS here and upgraded my desktop and OS to the 4.5, but today I switch to the 4.2 OS which support chinese, I did not change my desktop manager, after this I cannot install any other software. I just kept getting "No Additional Applications Found". I did a little search on google, and confirm that device software on my pc is the same as the one in my phone. Any suggestion on this. Thanks.