| downgrade it
brother download from server this file (I9100XXKH1)
you will find these files
CODE_I9100XXKH1_CL438706_REV02_user_low_ship.tar.m d5
GT-I9100-CSC-MULTI-OXAKH1.tar.md5
KERNEL_I9100XXKH1_CL438706_REV02_user_low_ship.tar .md5
MODEM_I9100XXKH1_REV_02_CL1046453.tar.md5
flash it with odin
after flash root your mobile
then repair your desire imei with z3x or lgetool
if z3x fails then (SGTool) will repair it 1000% |