@Kinkeen You can try the FW release from this post for the MU-MIMO issue on BE800 v1.

@tplnkuser101 Firmware Version: 1.13.5 Build 240222 Rel.50991n(5553) apparently is not uploaded on some regional support websites. If you have troubles with this FW release check this thread on how...

@Jarro Keep the satelitte router closer to your main router and use the FW releases I posted to achieve what you want.

An option to be able to disable this feature has been requested over a year ago - here.

@pcakhilnadh Try setting your main router DHCP server start IP 192.168.33.2 end IP 192.168.33.100 and set Archer C7 with IP address 192.168.33.254 (and its DHCP server off). Restart Archer C7 and...

@D3C0D3R Try changing the ethernet cable between your ONU and C6 (Cat 6A ?) with the cable which comes in the router kit and test if there's any difference. If that doesn't help just work with your...