You don’t need the router firmware, but the coordinator firmware.
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Unfortunately its the exact same situation (and error) when using the coordinator firmware.
Hi, I have stumbled upon this problem with my zigbee dongle-E. Seems that Sonoff sells two models, “dongle-e” which uses ember based adapter and “dongle-p (plus)” a zstack adapter. From your config I see your adapter is set to “ember” have you tried setting to “zstack” ? That helped me (a dumb little parameter change), I had “zstack” setting on my Dongle-E adapter, which failed with same error.
Hope this helps even after long time.
Note that on the zigbee2mqtt adapters zstack page this confusion is mentioned
