Thanks for the message.
I had VLAN “LAN” and VLAN “X1”. The firmware upgrade was done on a computer in LAN. Do not think it is a VLAN problem.
By resetting the router with the reset button (pinhole) in the router, I came in an “intital setup screen” but still firmware 2.8.6. From there I could re-enter and validate all settings among others my VLAN config, but it took a while.
It would be beneficial if the firmware is available on the downloads page.