while having a morning coffee i decided to poke around that firmware some more to find the actual manufacturer of it and from what i can find they call it a "ksmart box" or more specifically the model is "Ksmart_DSP" and the variant used in the holden is the "Box-C211"
some other interesting points
this appears to be the manufacturer of the box so if the ebay guy vanishes you should be able to get continued support from them.
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they also sell it on their site for $319 in what i am guessing is USD.
this is their aliexpress listing for the same thing $561 AU free postage
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something else they offer, it says it can be used with the carplay module, so by the look of it if you wanted 360 reverse cam you can add it.
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this is their aliexpress listing for the same thing $346 AU + 23 postage
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