Možná tady něco písají...
after many attempts and method, i finally success modify obb file ..
i use GOF2 for example
rename gof2.obb >gof2.zip
extract the needed file that u want to edit, in this case i extract "BIN > ships.bin"
edit the file (ships.bin) with hex editor
drag the modified "ships.bin" into the gof2.zip (original folder/file location), using "store" compression type
after the file inside gof2.zip updated, just fill '00' byte at the end of the zip file until the bytes size is same like original .obb
rename back the modified gof2.zip > gof2.obb done, works perfectly in game.
https://www.alphagamers.net/threads/how-to-edit-obb-file.15538/?c=1