It is unlikely that they have it though.
Only some parts were released under GPL. But the most significant parts were closed source.
The company manufacturing these devices is Penbex from Taiwan and this company is closed since 2011.

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penbex
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pzoltan
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OK. I try.

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penbex
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Right, ask Konig for that..
If we had the source files we would have a much better firmware than we have today..

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pzoltan
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Please send me the HAV-IR20 2.0.0.8c source file(s) . Thanks.