ok i solved it:
i've pressed the HOME + X Button while psx emulation to get into the retroarch menu and set autoload save stage and autosave stage to OFF in the loading config. Then i've manually updated my config file in configurations menu, activated "save config on exit"-option and selected "quit retroarch". NOT it works fine and i dont have to rename ALL the psx eboot files xD
thanks to myself for this solution haha