milk-v duo s image can't connect to board

i wonder anyone getting this problem. this image  (duos_sd.img.lz4) (procedure: download it. use lz4_win64 to unzip it and win32diskimage... to write it to the sd card). i going to router and see new ip address, connect to it by both debian/root account but both getting connection timeout.
i did the same with official buildroot image and it did connect. so is there anything which i done wrong?