I was able to unlock bootloader (with your suggested method), flashed TWRP, flashed SuperSU. Also, indian firmware on handset.
BUT, cmd not accepted command : dd if=/dev/block/mmcblk0p30 of=/sdcard/params.bak
Due to that I was not able to go forward and flash 6.0.1 china ROM.
What am I doing wrong in the process. Please suggest.