ddr3 2133 on LG A560-T.BG77P1

[gordobobo]

Hello, I bought 16GB kit of DDR3 2133 (corsair vengeance) for my notebook (LG A560-T.BG77P1) and it doesnt work.
Im currently using a 8GB kit (also corsair vengeance) DDR3 1600 and it works fine.
If I use 1 module of ddr3 2133 and 1 of 1600 it the notebook boots with 12GB working at 1600 MHz but I cant make both 2133 modules work at same time.

The bios has no option to configure memory.

Any help ?