I have purchased from aliexp 2 cam ds-2cd3345-I, a 4mm and a 2.8mm.
The cam 2.8mm has firmware 5.3.6 build 151103
The cam 4mm has firmware 5.3.6 build 151221
the cam to 4MM has a problem, if I change resolution to the cam I have a error, if I change some values to the cam I have a error. I...