@ADDolatabadi According to this feature request the range extender will preferably connect to the main router, not the other range extender.

@Harsh_k WR850 is an ISP provided device with a customized FW version - details.

@Merkaloff Reset AX10 to its factory defaults - press reset button for about 10 sec. Don't turn on QoS. Check your ethernet ports negotiated speed when in wireless router mode here: It should be...

@Kostanthsntoysl Check this FAQ regarding your inquiry.

@Kelvin1678 To utilize 5Gbps bandwidth from your ISP you have to use 10Gbps capable device. Here's the list of 10Gbps capable wireless routers.

@Volkan_Akkus_TR The DSL parameters in the status menu are the indicators of your DSL line quality: