Heho
If you migrate an existing Zigbee network you can choose to migrate the controller IEEE / Address.
Is it possible to revert that change? So that the sky connect gets his original IEEE again?
Supposedly with an appropriate jtag programmer it can be done.
Probably not worth the time, headache, and expense unless you have more than one to deal with.
Just buy a new stick.
Hahaha 
Okay just ordered a new one. The old one goes to family or friends (for the double of the original price 
) (joke)