@Dfds yes i am trying to install dsm on ssd connected on optical drive place. I dowloaded modded bios and flashed. but still i need to change some settings in bios i think. cuz still i m having the message "you dont have and harddisk". which settings i have to change i don't have any idea, i tryed couple about ide and sata but still same.
thanks for any advice.
edit: finally thanks all. I found it and now can install, in the southbridge setting need to disable ide section.