This may not be a helpful answer, but perhaps it may just not support DiSEqC 2.0?
Is there a document with specs regarding the built-in STB? Should mention in there which version of DiSEqC (if any) it does support. If it just says something like band switching via 22kHz tone burst or something like that and nothing else, it may not support that version of DiSEqC. A tone burst is one of the simplest examples of a DiSEqC "command" I guess you could call it.
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