Confirmed this method still works. However, you need new combination file with bootloader v2 and odin 3.13 or above. I initially flashed using odin 3.12 and CSC file was not flashed thus not able to select CSC when *#243203855# is entered. However, re-flashing the CSC file using 3.13 solved the issue.
Combination file with bootloader v2 :