You should flash with this files:

K750_R1DB001_FS_CHINESE_RED49 ( filesystem )
K750_R1DB001_MAIN_CHINA_CL_RED49 ( main )

K750c_CDA102338_42_R27A_CMCC_China
K750c_CDA102338_42_R32A_CMCC_China ( custom files - all )
K750c_CDA102338_7_R18A_Generic_Trade_China

Nice day