Thanx for the tip. But I also managed to upgrade from older config tool :). Guess I'm lucky I didn't brick device. Somebody should notify Dahua that all their wiki articles are completely wrong.
Oh and by the way, new firmware (2018-07-31) doesn't fix wifi issue with VTH5221D, it still rings...
I managed to update firmware with config tool 3.20. Firmware for VTH 5221 successfully updated to 20180731. I had problems with WIFI, VTO would call VTH but on answer call would fail. I have yet to test this with new firmware since it's midnight now and family is asleep :)
Another thing, after...