No one could use cross flashed firmware at B series. I think this is also true for C series too.
You cannot use VALDEUC simply. Also C630 has 2 different platform, one of it is MIPS CPU and other one ARM.
If you have MIPS CPU, valdeuc cannot work on that hardware. NO WAY.
If you have VAL6DEUC firmware, you can try executing VALDEUC firmware by external booting (don't know if it's possible on C series yet) but I bet for it doesn't work.
Samsung LE40C630 Hack possible?