Thanks. That is kind of what I figured. Since you seem know more about this, is a shared user used for sharing data between different apps or is it also/instead used for accessing parts of the OS or hardware? I guess I'm wondering if it really was just shared between apps then if I identified which ones then I could theoretically resign them with my key and get it working. But if the shared user is used for something else (which seems likely to me), then that wouldn't work. I'm not really sure I want to risk anything more on my ST16, but I am really curious.