Optional migration from Turris OS 3.x for advanced users

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Hello.
I’ve just updated my Turris Omnia from 3.11.20 to 5.1.3.

It looks like everything is fine except my wireguard connection: all configs are in place (doudle checked it)

 config interface 'VPS'
    option proto 'wireguard'
    option private_key '<mysupersecretkey>'
    option listen_port '443'
    list addresses '192.168.255.2'
    option delegate '0'
    option ifname 'VPS'

config wireguard_VPS
    list allowed_ips '0.0.0.0/1'
    list allowed_ips '128.0.0.0/1'
    option route_allowed_ips '1'
    option endpoint_port '443'
    option persistent_keepalive '25'
    option public_key 'hHSO4rSb6Bt6dgf5hQ8RytEoavyadnZaS3sqpFNAA2U='
    option endpoint_host '<mysupersecretip>'

but I get

Protocol:  WireGuard VPN
RX:  0 B (0 Pkts.)
TX:  0 B (0 Pkts.)
Error:  Unknown error (DEVICE_CLAIM_FAILED)

error on interface

How can it be fixed?