hahah damn, i should have listened to you scott. I had lame reception in my house, in rang of tl wr340g, which have one 2-3 dbi antenna. and i tried to flash openwrt, and putted luci gui manually but got same result.
Then i tried to boost signal with distance to last user or something, and after that, wifi was dead. I tried to flash oem firmware, and than i bricked it. . So i send it to retailer. It is so sucky router, i should go on e1200 from linksys or some asus. only if God helps me and they admit it is lousy specimen.