sorry for the late replyThanks to each of you for the support,problem is solved with image recovery via tftp. 

i dont have a usb port at my routerit an 878 router.could you please explain more about tftpdnld?in advance thankyou

your right thanks.rommon 1 > dir flash:Directory of flash:/23478272 bytes available (4096 bytes used)

hi Leo thanks for respons,this is the result of the command; dir flashrommon 1 > dir flashunable to stat flash/: permission deniedrommon 2 >

Hello Rick,Thankyou for your answer.Yes the router have card inside, but i think the problem not hardware but software. It have no IOS Into the flash memory.