ummm.... read this: ''Wanna downgrade your firmware?
Downgrading your firmware requires special equipment. A Nokia Serice Point can do it for you, but they'll try to refuse. If you upgraded the firmware of your Nokia 6120 Classic to the first hackproof firmware version (6.01), you may find that the new firmware introduces all sorts of new bugs and sucks your battery dry really fast. That's a good reason to demand a downgrade to the previous version (5.11). Firmware upgrades of other phone models may bring new bugs too, and if you claim that the new firmware broke the connection between your phone and your wireless router, or if your computer won't talk to your phone over bluetooth anymore, the people at the Nokia Service Point will have to take your word for it unless they're willing to visit you at home.''
or click here http://redpepper007.ucoz.com/news/2009-01-27-61