Try hard resetting router using the 30-30-30 procedure:
1. Power on the router
2. Hold the reset on the back for 30 seconds, until orange led start blinking.
3. While still holding the reset button, remove the power plug and keep pressing reset for another 30 seconds.
4. While still holding the reset plug in the power connector and keep pressing reset for another 30 seconds.
5. Release the reset button and after a few seconds connect to router's default IP (192.168.0.1) with your browser. Don't use browsers other than Internet Explorer, they won't work.
6. In bootload form select the right firmware binary and send it to router. When finished (100%), wait a few seconds and repeat resetting steps 2-4
7. Finally unplug the power connector (without pressing reset), wait for another 30 seconds and power on the router.
I hope it helps!