UPNP not starting, external interface not found

Software SW bugs discussion
3

Yep, that was also my first guess but /etc/config/network states:

config interface 'wan'
    option proto 'mbim'
    option device '/dev/cdc-wdm0'

and /etc/config/upnpd for example has the Option set as well (tried with “wan” and “wwan0”):

config upnpd 'config'
    option download '1024'
    option upload '512'
    option internal_iface 'lan'
    option port '5000'
    option upnp_lease_file '/var/upnp.leases'
    option uuid 'b011d895-a0dd-47bc-9a57-cca06d904fa1'
    option external_iface 'wwan0'

So i am pretty out of ideas currently…