I came to this thread because I had a similar problem with another internet provider. With the ER605 alone I was not able to get it running. Then I setup Omada Software Controller on my PC and...

@vivideng I had the same problem. I couldn't reset it. What I tried was that I took the power plug out, put it in again, and then I pressed the reset button (up to 20 seconds). It did not reset! Then...