Unhappy [q] after upgrading cwm 10.1.6

GUYZ.. i bAdly need your help.. after i've upgrade from 2.3.4 to CM 10.1.6, it ask for network lock again even if i already openline and unlock it twice .. i try to refer it again to repair station but they cant, they told me to downgrade it since they cant activate any secret dial codes on my samsung galaxy gio while trying to unlock it.
..i try the 8 zeroes also but nothing happened even the using terminlal emulator.. huhuhuh.. what shoul i do..???