All these problems are only appear then used the Chinese board (not original).
Chinese GV-1480(or any other) are work properly only with software that comes with the kit.
The problems begin after software upgrading and firmware updating.
This question is solved by the seller.
The problem is that the 8 version of GV boards keys stored in the card, in my opinion it is a small chip in the lower right corner, on my сршз markings erased.
To avoid such problems, it is necessary to block access to the Internet, it is suspected that it somehow provides verification and in case of detection of counterfeit product it writes or erase something in firmware and as a result - we have all these problems.
http://www.cctvforum.com/viewtopic.php?f=36&t=22474&start=0&hilit=horizontal
This topic is the same problem, just no one knows what the problem is in counterfeit product
