Adboards are stadium specific....They are also competiton specific.
I think that you will get different boards in the french league for example, a dutch league would be different again, It may even be language specific.
I assume that Master League has you playing in the same stadium for every home game that you play remember.....
If you want to change them at any time, just open cv_1.img in GGS, scroll down to _38.bin and you can then drag and drop whatever adboards you like from the adboard collection folder and change the one's in game.....
I can't really suggest much more than that until there is a fully working kitserver released.....If anyone can suggest a way to have different boards in EVERY stadium at any one time, then let me know.
This kind of limitation has been around since pes1.
" Trad Brick " had stadium specific boards and so did some other stadiums like san siro in older pes games.
There are only 4 out of the 15 stadiums in the new version which are stadium specific.
All i know is that the .bin file in my download, replaced about 80 of the 103 default adboards. I kept getting errors trying to replace the last 20 or so, but GGS 7.3.0 has resolved this issue.