If you are desperate, try the arp command (search google for how to use arp for change IP address). I haven't done it since the 1990's, so don't ask me for details. Your cameras may have the ability disabled.
I would buy new cameras.
I had to sign for my new B5442E-Z4E this week from DHL. Seems like they'd skip that requirement now. I did wash my hands before unpacking the goodies, then washed them again after throwing the wrapping away.
Mine takes a long time to respond whenever I connect it. I started moving it around this month to test in various locations, and every time I plug it in, it takes a long time to respond. I got used to it and find something else to do for awhile. I don't know how long it takes to come to life...
The Dahua docs say the PFA130E has 3/4" pipe threads. You probably want the 3/4" size fitting mentioned in other posts. 3/4" conduit has an outside diameter close to one inch. So, if you measured the hole, you probably came up with 1".
I use the CPL filter with my Mini 0806. It almost eliminates glare. I think it's worth it.
I don't connect the camera to my computer, nor am I interested in parking mode, so I can't address those issues.