I have 2 RT-AX86U with 388.1 merlin firmware ( RT-AX86U-01 and RT-AX86U-02).
- on RT-AX86U-01, I installed FlexQoS, config DHCP for all LAN Network, config Guest network wl0.2/wl1.2 on br0.
- on RT-AX86U-02, I config LAN IP (Disable DHCP on RT-AX86U-02), Disable WAN, config Guest network...