EDIT:
Sigh... NEVER MIND
After reading sooo many times about how the first step after new firmware (or strange problems) is to reset the camera , I didn't do it.
And then I did, and now it works just fine.
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Is anyone currently using external control of the day/night switch for this cam? How are you doing it?
I've got four other Empiretech cams (T54PRO, two T54IR's and a Color4K-T) that work great by using versions of this call (from this forum):
This PTZ425DB-AT only gives a 404 error to this kind of call. There's a 2023 post in this thread that says this should work. No luck.