You factory reset from the cam directly (the HW reset button). Therefore if you have upgraded to 08/28 either wait for September release (already reported the issue to Dahua) OR if you do downgrade be prepared that although the FW will be loaded you cannot access the cam via IP or config tool until you reset using the physical HW reset button.
HTH
Thanks
@Wildcat_1
1. So we hope and believe that the (up)grade, unlike the (down)grade should work. if it would, it's gonna be the easy and straightforward way to go.
pressing the button takes not only ladder, it's also repositioning the T-ZE cams cause I'd probably won't have access to the cover without moving the cam..
not the end of the world, but the other way takes only days/weeks of waiting, I'd rather wait.
** it'll take some time to wait cause till Oct. 8th everyone in China is on holiday and there would not be even any progress by then.
2. Just for the curiosity, the older FW is loaded and the hard reset while power is on would initiate the install and reboot to the older FW?
3. I have mentioned before that I didn't even try the 7/29 FW cause I already heard from a friend that the IVS problem is not solved there.
@looney2ns is not the only one claiming that the problem exist with the Jul FW. that thread is full of complaints and I also have some in private.
4.
@looney2ns : if you want to play with hard reset, you do not need to install the 2808 FW, you are welcome here. I did half of the job.... ;-)
Adding everything together for the sake of others : if IVS is the most important feature for you, the Dec FW is the last stable and actually doing a great job. do not try the 2021 FW's
Otherwise, you may try the Jul FW or even May FW BUT whatever you do, skip the 2808 FW and delete it if you got it somehow.