ds-7108hgh f1/n

I am facing a problem that I couldn't find on internet. When I change any configuration of my DVR and save it, it works fine. But after restart it goes back to previous configuration. I tried to factory reset, but after factory resetting when the device restarts, it goes back again to that...

Hello everyone, I speak English not good. I am using a DS-7108HGH F1 / N DVR from Taobao Chinese version, after updating to version (V3.4.80 build161217), my recorder can not be used as usual, in web browser can not set camera parameters, everything freezes after operation, I connect to the LCD...