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How to remove the dead End Device in network?

In my network,there are one Coordination,many Routers and EndDevices.Sometimes there is a Router or EndDevice broken,that I will instead of it with new one.

list and Router in neighborTable.If they are not removed,New Devices can't join in.

In home 1.2.0,dead EndDevice can be removed by Child Aging,but it seem  that the AddrMgr will not remove the EndDevice whose Parent is not coordination.

Is there some way to remove Router or EndDevice perfectly?