GL-MT300N-V2 Wireguard Invalid IP address

why wireguard suddenly doesn´t work anymore?
When I try to enable it I get “invalid IP address” error. This is simply a bug because before this issue didn´t exist.
Router is GL-MT300N-V2

It is a bug when you upgrade from old firmware. Here are what you can do to fix this:

SSH to the router and issue the two command

uci set wireguard_server.@servers[0].local_ipv6='fd00:db8:123::1' 
uci commit 

Or just reset the firmware and start over.

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