In DrayTek routers the ACT LED will flash once every second to indicate that the router is operating correctly. However, under some conditions the router firmware may become corrupted and place the router into an abnormal state.
When the router is in this condition it cannot be reached by either telnet or the web browser. The only option is to re-install the firmware to recover the router to a working state.
This video will show you the steps required to re-install the firmware into the router to restore it to operational condition.
Click here to watch the Video