Importing custom numbers into Jersey iff

Hi, is there a tutorial on how to do it? As I can't seem to import my own texture.
As far as I remember, it should be 'indexed' image mode and then save as dd5. Am I missing something? Cause it won't let me save at all

Here's what I have found on various websites.

edit all TXTR files for letters & numbers (the ones you actually change)
viewtopic.php?f=258&t=108087&p=1982519&hilit=font_number_color&sid=82db803bde7ea2670a74383006efbdd7#p1982519

font letter color mips1 alpha BC7 8bpp fine (linear, DXT11+) or 8:8:8:8 ARGB (32 bit)
font letter false color mips1 alpha BC7 8bpp fine (linear, DXT11+) or 8:8:8:8 ARGB (32 bit)
font letter normal mips 1 alpha BC7 8bpp fine (linear, DXT11+) or 8:8:8:8 ARGB (32 bit)
font letter region mips 1 BC1 4bpp (linear) or DXT1 no alpha

may have to use auto mips, depends on the plugin used

viewtopic.php?f=259&t=109637
https://www.nba-live.com/forums/viewtop ... 8&t=108533

Typically, I use Gimp for editing jerseys, so the exported information is slightly different, but largely the same when exporting textures. As Bassman58 said, you need to delete certain strings within the .TXTR files. When exporting the textures, make sure they're the same image size as the original files and export them at the appropriate textures.

If you use Gimp, you need to download the dds plugin and save the textures as DXT1 and tick Generate Mipmaps.

Oh wow, this has changed indeed.
Thanks guys for your help, I'll try this out.