annoyingly Eufy doesnt publish changelogs of Firmware versions
The discrepency between the three cameras firmware versions could be due to the fact that
Eufy was experiencing a chip shortage due to covid and put different chips in some of the cameras
which has led to a really confusing and covulted firmware situtation as each chips run on different firmware.
Whats more is, there was diffrent funtionality on some of the chips, i.e the newer ones they are using in the chip shortage don’t support ‘activity zones’ you might want to check this is funtional on ‘all’ cameras.
I am guessing this chip situation is why I and numerous others have bought cameras that are not working as advertised and about as much use as a paper weight at present. I say guess because Anker have chosen to be very un-transparent about the situation.