as reading more and more, VLAN 1 is maybe not best for main LAN, so will move that to different VLAN number and leave VLAN1 as is.

Just tried to add VLAN50 untagged for all ports 1-8. After I put VLAN 1 tagged for uplink port 1-4,8, WLAN connection is gone... Just putting tagged on Port 8 - ROuter > Switch , this at least keeps...

ok many thanks will try. So you mean just on uplink e.g. Port 8 (TL-SG108PE) - (VLAN 1t, 10t, 50u ), or should I leave vlan 50 untagged on all port...

Hello, connecting Openwrt and Netgear switch I select tagged for all VLAN 1t, 20t on both sides for each Port. Between Openwrt and TL-SG108PE, I need to leave the connected Port 8 on TPLink switch...