dahua 4116

Hello, I purchased a 2nd hand NVR from Dahua and saw that the FW was really old From what I can tell this is a "gray zone" Chinese version and I wan't to check if it's possible to upgrade FW Current FW: Web: 3.1.0.52472 System Version: 3.200.0000.8.R Build Date: 2015-04-28 On one IP cam site...