Can someone please let me know how to get the letters instead of the numbers whilst hacking LG DVD players? (In this case a LG6353)

The Hex information looks like:
55 53 00 DD 16 55 60 FF (old)
55 53 00 D7 16 55 60 FF (new)

But I made a mistake and put a 7 instead of the first 'D' instead of the second one and my picture is now black & white. I think it's changed the tv standard (pal/ntsc...).

This information could be useful.