I updated to 3.1 FW, not knowing that you cannot downgrade. And now I'm currently stuck on 3.1. I do not have my ECID SHSHs on file with Cydia, which means I am unable to downgrade to 3.0/3.0.1. I have the option of going to the AT&T store I bought my iPhone from, and having it exchanged (hopefully with one that is running 3.0/3.0.1 and not 3.1). Should I exchange my iPhone 3G S? If I do exchange it, would there be any benefits, as far being able to run 3.0/3.0.1 FW again goes? I need some advice. Thank you!