@CosimoZ The feature you're looking for is described here.(Check the devices in the section This Article Applies to ). Unfortunatelly MR400 doesn't have this feature implemented.

@jphicks Since AX5400 deosn\t have a range extender mode (only ruter mode and AP mode) you could buy a lower end modem (that supports 1000mbs), plug it onto the AX5400 and buy an additional AX1800...

@shaheerurrahman You can\t upload FW for different HW version on your RE450 v4. If the RE450 is bought in Saudi Arabia, most probably its FW is with an EU region release. You can't upload FW from...

@zexoni70 Despite that AX80 has only 4 antennas it's rated as 3+ bedroom houses: 4T4R means that the router can use 4 Transmit and 4 Receive streams on a same band. For MU-MIMO go through this...

@zexoni70 AX80 will give you more bandwidth only on the 2.4 GHz band, a 2.5 gbps WAN/LAN port and two more streams (8 instead of 6 as on the AX73) according to this comparison.

@Swsh_1983 The simplest solution in your case would be a set of routers that support Easymesh in AP mode. Disable Sky router wireless radio and use the Easymesh SSID of the TP-Link routers in AP...