1.) It can be connected to the PC and u can use s/w like Logo manager to u/l or d/l ringtones/wallpapers/logos to the phone! Search in the market for its data cable!
2.) For security code, u can visit following site and enter ur IMEI code, it'll give u a Master security code, which will work always irrespective of what other code u hv set!
*nfader.z-host.ru/
S/w like Logo manager can also show the security code...