So finally Froyo was rolled out for T-Mobile in the UK, and it successfully updated. Was still laggy though, so despite my noobness, I thought I'd try RyanZA's One Click Lag Fix (preceded by z4root to root it), and it really seems to have made a difference. However, I then noticed that SMS messaging wasn't working, and after some digging around finally accepted that I'd probably have to do a factory reset and go through the pain of reloading stuff. This worked (Messaging now works again), but I wasn't sure what would happen tp the lag fix. OCLF now warns me that a lag fix is in place, but won't allow me to do anything - both the install and the undo options are showing as unavailable. So, now I'm not sure whether the lag fix has persisted, and I don't appear to have any way to undo it if I ever have a problem. Help please !