Jersey Numbers Editing

So im making some jerseys and i wanted to change the numbers colors and everytime when i save it and i open the game the numbers are just invisible, does somebody knows what type of a dds format do i need to save it as?

I've only edited a few uniforms so somebody else may have a better answer. For me this worked. Depends on what DDS plugin and what version you use.

font letter color 8:8:8:8 ARGB (32 bit) 1 mipmap
plus you need to edit the TXTR files

font number color mips1 8:8:8:8 ARGB (32 bit)
font number normal mips1 BC7
font number region mips1 DXT1 no alpha (BC1)