I got a GL-BE9300 that I configured today, I had PPPoE working, SSH access and the LuCI interface but then after installing and enabling adguard-lite I seem to have rendered it unreachable either via Ethernet or Wi-Fi, so I have tried doing a hard reset on it – holding the reset button for 10 seconds, but this hasn’t made any difference, I can’t get access to it, with previous GL.inet devices I’ve used a serial to USB 2.0 device like this one to sort the router out, are their pins on the board to do this with this router and if not can anyone suggest what else I could do other than returning it as bricked?
Ignore me 
I followed the instructions and started again, all is good :-).