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    DS-2CD2387G2-LSU/SL - 2 Way Audio doesn't work, camera reports no errors - What is the last firmware which allows downgrades?

    I've got two or three LSU models of this camera here. The ones I am actively using are on firmware V5.7.3 build 220112, as I want the LED light linkage feature which is later removed from these cameras (for absolutely no good reason that anyone is publicly aware of). I can't get two way audio...
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