@Kinzang To reset your router administrative password you have to press the router reset button for about 10 seconds. The default username/password after factory reset is admin/admin.

@Mr-Arash I would go for VR400 and Easymesh capable Archer AX10. Easymesh is a newer technology - here you can check its description and comparison. There's a scenario where your main router (VR400)...

@Birger72 Try using service filtering to achieve that - user guide - chapter 13.2.

@Waterfox You may use AX11000 in AP mode to extend your wireless coverage in a distant areas of your premises - details (Case 1).

@Safi_Kamal-7883 Use this guide for configuring the router remote management. Try setting the remote management port to 8080. Make sure that your router WAN IP address is a public IP address...

@Idc_Idk Only your retailer can answer this question, as well as a possible return window for the item and buying a new one.