thanks bro
today i bought the ethernet switch and now my router is detecting by tftp and tftp sent the firmware to router but on router nothing happened it stays on just the power light on
If the tftp succeeded completely is already a good sign, meaning that the bootloader is still mostly intact and both requests the (push-button) tftp transfer and accepts it, not flashing the image can have two reasons (well, one, caused by different circumstances):
the bootloader not recognizing the uploaded image as valid
be it because of the wrong (and/or region-coded) image being uploaded
use the right image, done
or because the ubootenv settings telling the bootloader what h/w IDs and region codes to accept have been clobbered somehow
this is harder to fix, as you will need at least serial console access to read/ write u-bootenv variables (if the installed system can't boot anymore)