Thank you for you reply.
I’ll check the topic you linked out. There was some kind of mistake copypasting the export. Here’s a fresh one hand edited:
[admin@RT-MikroTik] > /export
RouterOS 7.18.2
#
# model = S53UG+M-5HaxD2HaxD
/interface bridge
add name=BR1 vlan-filtering=yes
add admin-mac=48:A9:8A:CE:31:21 auto-mac=no comment=defconf name=bridge
/interface lte
set [ find default-name=lte1 ] allow-roaming=no band="" nr-band=""
/interface vlan
add interface=BR1 name=VLAN100 vlan-id=100
add interface=BR1 name=VLAN200 vlan-id=200
add interface=BR1 name=VLAN300 vlan-id=300
/interface list
add comment=defconf name=WAN
add comment=defconf name=LAN
/interface wifi datapath
add bridge=BR1 name=DP100 vlan-id=100
add bridge=BR1 name=DP200 vlan-id=200
add bridge=BR1 name=DP300 vlan-id=300
/interface wifi security
add authentication-types=wpa3-psk disabled=no ft=yes ft-over-ds=yes name=secMainNet
add authentication-types=wpa2-psk disabled=no ft=yes ft-over-ds=yes name=secGuestNet
add authentication-types=wpa2-psk disabled=no ft=yes ft-over-ds=yes name=secIotNet
/interface wifi configuration
add country=LaLaLand datapath=DP100 disabled=no name=MainNet security=secMainNet ssid=MainNet steering.rrm=yes .wnm=yes
add country=LaLaLand disabled=no mode=ap name=IoTNet security=secIoTNet ssid=IoTNet steering.rrm=yes .wnm=yes
add country=LaLaLand disabled=no name=GuestNet security=secGuestnet ssid=GuestNet steering.rrm=yes .wnm=yes
/interface wifi
# no connection to CAPsMAN, managed locally
set [ find default-name=wifi1 ] configuration=MainNet configuration.manager=capsman-or-local disabled=no
add configuration=IoTNet disabled=no mac-address=4A:A9:8A:CE:31:27 master-interface=wifi1 name=wifi1_IoTNet
add configuration=GuestNet disabled=no mac-address=4A:A9:8A:CE:31:26 master-interface=wifi1 name=wifi1_GuestNet
# no connection to CAPsMAN, managed locally
set [ find default-name=wifi2 ] configuration=MainNet configuration.manager=capsman-or-local disabled=no
/ip pool
add name=default-dhcp ranges=xxx.xxx.xx.10-xxx.xxx.xxx.254
add name=pool100 ranges=xxx.xxx.xxx.40-xxx.xxx.xxx.254
add name=pool200 ranges=xxx.xxx.xxx.40-xxx.xxx.xxx.254
add name=pool300 ranges=xxx.xxx.xxx.40-xxx.xxx.xxx.254
/ip dhcp-server
add address-pool=default-dhcp interface=bridge name=defconf
add address-pool=pool100 interface=VLAN100 name=dhcp100
add address-pool=pool200 interface=VLAN200 name=dhcp200
add address-pool=pool300 interface=VLAN300 name=dhcp300
/queue type
add fq-codel-ecn=no kind=fq-codel name=fq-codel-ethernet-default
/queue interface
set ether1 queue=fq-codel-ethernet-default
set ether2 queue=fq-codel-ethernet-default
set ether3 queue=fq-codel-ethernet-default
set ether4 queue=fq-codel-ethernet-default
set ether5 queue=fq-codel-ethernet-default
/disk settings
set auto-media-interface=bridge auto-media-sharing=yes auto-smb-sharing=yes
/interface bridge port
add bridge=bridge comment=defconf interface=ether2
add bridge=bridge comment=defconf interface=ether3
add bridge=bridge comment=defconf interface=ether4
add bridge=bridge comment=defconf interface=ether5
add bridge=bridge comment=defconf interface=wifi1
add bridge=bridge comment=defconf interface=wifi2
add bridge=BR1 interface=ether1 pvid=100
/ip neighbor discovery-settings
set discover-interface-list=LAN
/interface bridge vlan
add bridge=BR1 tagged=BR1 untagged=ether1 vlan-ids=100
add bridge=BR1 tagged=BR1 vlan-ids=200
add bridge=BR1 tagged=BR1 vlan-ids=300
/interface list member
add comment=defconf interface=bridge list=LAN
add comment=defconf interface=lte1 list=WAN
add interface=VLAN100 list=LAN
add interface=VLAN200 list=LAN
add interface=VLAN300 list=LAN
/interface wifi cap
set enabled=yes
/interface wifi capsman
set enabled=yes interfaces=BR1
/interface wifi provisioning
add action=create-dynamic-enabled disabled=no master-configuration=MainNet slave-configurations=GuestNet,IoTNet supported-bands=2ghz-ax,5ghz-ax
/ip address
add address=xxx.xxx.xx.1/24 comment=defconf interface=bridge network=xxx.xxx.xx.0
add address=xxx.xxx.xxx.1/24 interface=VLAN100 network=xxx.xxx.xxx.0
add address=xxx.xxx.xxx.1/24 interface=VLAN200 network=xxx.xxxx.xxx.0
add address=xxx.xxx.xxx.1/24 interface=VLAN300 network=xxx.xxx.xxx.0
/ip dhcp-server network
add address=xxx.xxx.xxx.0/24 comment=defconf dns-server=xxx.xxx.xxx.1 gateway=xxx.xxx.xx.1
add address=xxx.xxx.xxx.0/24 dns-server=xxx.xxx.xxx.1 gateway=xxx.xxx.xxx.1
add address=xxx.xxx.xxxx.0/24 gateway=xxx.xxx.xxx.1
add address=xxx.xxx.xxxx.0/24 gateway=xxx.xxx.x.1
/ip dns
set allow-remote-requests=yes
/ip dns static
add address=xxx.xxx.xx.1 comment=defconf name=router.lan type=A
/ip firewall filter
add action=accept chain=input comment="defconf: accept established,related,untracked" connection-state=established,related,untracked
add action=drop chain=input comment="defconf: drop invalid" connection-state=invalid
add action=accept chain=input comment="defconf: accept ICMP" protocol=icmp
add action=accept chain=input comment="defconf: accept to local loopback (for CAPsMAN)" dst-address=127.0.0.1
add action=drop chain=input comment="defconf: drop all not coming from LAN" in-interface-list=!LAN
add action=accept chain=forward comment="defconf: accept in ipsec policy" ipsec-policy=in,ipsec
add action=accept chain=forward comment="defconf: accept out ipsec policy" ipsec-policy=out,ipsec
add action=fasttrack-connection chain=forward comment="defconf: fasttrack" connection-state=established,related hw-offload=yes
add action=accept chain=forward comment="defconf: accept established,related, untracked" connection-state=established,related,untracked
add action=drop chain=forward comment="defconf: drop invalid" connection-state=invalid
add action=drop chain=forward comment="defconf: drop all from WAN not DSTNATed" connection-nat-state=!dstnat connection-state=new in-interface-list=WAN
add action=accept chain=input in-interface-list=LAN
add action=accept chain=input comment="Allow CAPsMAN UDP 5246" dst-port=5246 protocol=udp
add action=accept chain=input comment="Allow CAPsMAN UDP 5247" dst-port=5247 protocol=udp
add action=accept chain=input comment="Accept established LAN connections" connection-state=established,related,untracked
add action=accept chain=input comment="Allow new management and web traffic from LAN" connection-state=new dst-port=22,8291,80,443 in-interface-list=LAN protocol=tcp
add action=drop chain=input comment="Drop all other new LAN input" connection-state=new in-interface-list=LAN
/ip firewall nat
add action=masquerade chain=srcnat comment="defconf: masquerade" ipsec-policy=out,none out-interface-list=WAN
add action=masquerade chain=srcnat out-interface=lte1 src-address= xxx.xxx.100.0/24
add action=masquerade chain=srcnat out-interface-list=WAN
add action=masquerade chain=srcnat out-interface=lte1
/ipv6 firewall address-list
add address=::/128 comment="defconf: unspecified address" list=bad_ipv6
add address=::1/128 comment="defconf: lo" list=bad_ipv6
add address=fec0::/10 comment="defconf: site-local" list=bad_ipv6
add address=::ffff:0.0.0.0/96 comment="defconf: ipv4-mapped" list=bad_ipv6
add address=::/96 comment="defconf: ipv4 compat" list=bad_ipv6
add address=100::/64 comment="defconf: discard only " list=bad_ipv6
add address=2001:db8::/32 comment="defconf: documentation" list=bad_ipv6
add address=2001:10::/28 comment="defconf: ORCHID" list=bad_ipv6
add address=3ffe::/16 comment="defconf: 6bone" list=bad_ipv6
/ipv6 firewall filter
add action=accept chain=input comment="defconf: accept established,related,untracked" connection-state=established,related,untracked
add action=drop chain=input comment="defconf: drop invalid" connection-state=invalid
add action=accept chain=input comment="defconf: accept ICMPv6" protocol=icmpv6
add action=accept chain=input comment="defconf: accept UDP traceroute" dst-port=33434-33534 protocol=udp
add action=accept chain=input comment="defconf: accept DHCPv6-Client prefix delegation." dst-port=546 protocol=udp src-address=fe80::/10
add action=accept chain=input comment="defconf: accept IKE" dst-port=500,4500 protocol=udp
add action=accept chain=input comment="defconf: accept ipsec AH" protocol=ipsec-ah
add action=accept chain=input comment="defconf: accept ipsec ESP" protocol=ipsec-esp
add action=accept chain=input comment="defconf: accept all that matches ipsec policy" ipsec-policy=in,ipsec
add action=drop chain=input comment="defconf: drop everything else not coming from LAN" in-interface-list=!LAN
add action=fasttrack-connection chain=forward comment="defconf: fasttrack6" connection-state=established,related
add action=accept chain=forward comment="defconf: accept established,related,untracked" connection-state=established,related,untracked
add action=drop chain=forward comment="defconf: drop invalid" connection-state=invalid
add action=drop chain=forward comment="defconf: drop packets with bad src ipv6" src-address-list=bad_ipv6
add action=drop chain=forward comment="defconf: drop packets with bad dst ipv6" dst-address-list=bad_ipv6
add action=drop chain=forward comment="defconf: rfc4890 drop hop-limit=1" hop-limit=equal:1 protocol=icmpv6
add action=accept chain=forward comment="defconf: accept ICMPv6" protocol=icmpv6
add action=accept chain=forward comment="defconf: accept HIP" protocol=139
add action=accept chain=forward comment="defconf: accept IKE" dst-port=500,4500 protocol=udp
add action=accept chain=forward comment="defconf: accept ipsec AH" protocol=ipsec-ah
add action=accept chain=forward comment="defconf: accept ipsec ESP" protocol=ipsec-esp
add action=accept chain=forward comment="defconf: accept all that matches ipsec policy" ipsec-policy=in,ipsec
add action=drop chain=forward comment="defconf: drop everything else not coming from LAN" in-interface-list=!LAN
/system clock
/system identity
set name=RT-XX
/system note
set show-at-login=no
/system routerboard mode-button
set enabled=yes on-event=dark-mode
/system routerboard settings
set auto-upgrade=yes
/system routerboard wps-button
set enabled=yes on-event=wps-accept
/system script
add comment=defconf dont-require-permissions=no name=dark-mode owner=*sys policy=ftp,reboot,read,write,policy,test,password,sniff,sensitive,romon source="\r\
\n :if ([system leds settings get all-leds-off] = \"never\") do={\r\
\n /system leds settings set all-leds-off=immediate \r\
\n } else={\r\
\n /system leds settings set all-leds-off=never \r\
\n }\r\
\n "
add comment=defconf dont-require-permissions=no name=wps-accept owner=*sys policy=ftp,reboot,read,write,policy,test,password,sniff,sensitive,romon source=\
"\r\
\n :foreach iface in=[/interface/wifi find where (configuration.mode=\"ap\" && disabled=no)] do={\r\
\n /interface/wifi wps-push-button \$iface;}\r\
\n "
/tool mac-server
set allowed-interface-list=LAN
/tool mac-server mac-winbox
set allowed-interface-list=LAN