I would like to update my T-Mobile 8320 to the latest OS version, but I've read it's an AT&T version. I still use MyFaves, and so, was wondering if I could use this version? If not, which would be the latest T-Mobile version and were might I find it? (I do not want the US version - 4.5.0.81 - since it contains the browser security bug). Thanks in advance.