1) Edit CharRUS.csv , how on example0000.png

C0;6;FC222222FC000000


C0 = code in codepage 1252
6 = pixel size of char font (5 on font + 1 clear!)
FC222222FC00 = graph , see on example0000.png

2) Run FontRebuild.exe
 
2.1 Press Scan Font
2.2 Press Change 1252 from CSV
2.3 Press Save All block , now new file saved

3) rename new file to skin.data and run again Scan Font for test

4) now ready to replace in firmware 