Can i upgrade a G4 device? - Upgrading, Modifying and Unlocking

hi All
i am new on this forum and i dont know much about this so please help me!!!
can downgrade from G4 to G3???????
i have a G4 cingular 8125 is there any way i can upgrade my ROM??????
or can CIDUnlock my G4 device???
please help me!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
help me please.... i will thank u a lot
thanks in advance

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