First you need Odin to flash your phone . If you're here you propably have got one . I recomend 3.04 or higher or 1.86 version .
1.Connect your phone to PC with Odin Flash Mode (home+ volume down + power during start )
2.In the Odin select PIT , CSC , PDA Files from pack :
It's only one rom with all working files i found in the internet .
It's Rom for Russia (SEB) and will change your region code .
4.Welcome on GB again . For sure to the time of full release of JB .
PIT File only :
(You can try to flash one file rom . It's can work . Maybe . But more safe metod is using full SEB Rom )
FIRST YOU NEED TO FLASH USING SEB ROM IN POST , THEN ANY GB YOU WANT !
Q and A
1.Did I can flash any GB ROM using one file rom and the added PIT File ?
A:No , you can't . First you need reflash your phone using russian 3 file rom , after this you can do everything you want .
2. It's working ?
If you know what is Odin , how to flash and doing everything like in this how to , for sure this is working .