Tado extension kit - de-registering

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Hi,

I bought a tado extension kit second hand, which I now want to install. I have been unable to register/activate it because it hasn't been deregistered by the previous owner, who is not responding to my communications. Is there anything at all I can do or is this just now e-waste? It would be such a shame if that's the case as it seems like perfectly good hardware has to be thrown away because it can't be reset!

Thanks for any assistance,

Alex

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