Welcome every on. At the beginning I wonâ€™t to apologize for my pure English. I made SD Mode, but itâ€™s not working. Iâ€™ve checked all GPIO pins on the SD Card slot and every things is ok. Iâ€™ve checked all signals with the scope and this small program (for all GPIO pins) : while true; do gpio enable 5; sleep 1; gpio disable 5; sleep 1; done Iâ€™ve try to measure Clock signal (GPIO 3) after turning on the router (Iâ€™ve enable MMC in the router) but there is only logical signal (+3.3V) and after few second signal goes down. Iâ€™m using DD-WRT v23 SP1 05.01.2006 VOIP firmware. I wonted to use SD card from my cell phone (NOKIA 6320i). It looks more like MMC then SD (it has only 7 pins). Maybe some one can give me some advise if there is any way to check some thing in software side (I donâ€™t now to much about Linux).