Why don't you start over and tell us exactly what you have done.
First flash?
Build used?
Is router bricked/boot loop?
Connected by wire or wireless?
Have you ever been able to reach the router?
i am using netgear R6300 , i was using DDWRT farmwear , after i updated new version of ddwrt , after restart router cant access , by ip or wifi , only power light is there, i try to reset but its not working , now wifi signal also not showing , i try to connect with 192.168.1.1 and 192.168.0.1 but dont accessible even i try to give static IP on the pc. how to recover the router now