Last night:
Unit arrived with V5.2.4 build 190304. I manually configured it in BI using the RTSP strings in the 101 post.
A few hours later the iOS app notified me that V5.2.4 build 190708 was available, so I upgraded to that. Went into BI and clicked the Find/Inspect button and it reset the RTSP path I had manually entered to just "/", which worked.
This morning:
Used the iVMS-4200 Client to turn off the EZVIZ logo.
Upgraded to LaView 190716 firmware. Logo remained off. Did another Find/Inspect in BI. Not sure any BI config settings changed. Video/audio seem to be working fine in BI, but I'll have to wait for someone to come on the porch to see if the camera is triggering BI alerts. Makes me wonder if ONVIF was working OK in the EZVIZ 190708 build.
Side note, I stopped getting EZVIZ app alerts last night when I disabled Alarm Notifications > Set the mode > Mute in an attempt to stop the doorbell from making a beep when it detected motion. ::shrug::