I bought a riocar remote and it's stopped working. My Kenwood remote works fine. Is this a v2 bug or faulty remote?

I can see the kenwood in hijack button codes, no go for the rio though :-(

I've swapped batteries and still only the Kenwood works.
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-- Murray I What part of 'no' don't you understand? Is it the 'N', or the 'Zero'?