help stuck on firmware upgrade error go to kies & try again

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http://forum.xda-developers.com – help i was trying to go back to stock and didnt realize that my bootloader was locked , i tried to odin stock firmware got an error and now im stock in firmware encontered issue. from what i have read bootloader had to be unlock before flashing and now is lock how can i fix this please helppp. (HowTos)