I need help from other LND gurus.

I have an inbound channel from a node that in the moment he opened with me, his node crashed. He's a total noob and for the last 2 weeks he wasn't able to restore his node. A mess... anyways.

So the channel was confirmed, but it never get activated. My side is 0 sats, it doesn't let me to force close or normal close.

Is there a way, a special cli command to get rid of this zombie channel ? I tried from Thunderhub, from RTL, from cli with lncli closechannel --force <chanid> and always I get the "unknown error", channel not closing.