Thanks for the firmware. Worked for my Oswoo 16CH NVR. I updated from "1.0.1.5121" to "1.0.1.5927", no problems.
@Hermann I don't think you can flash from 8CH to 16CH, the boards is totally different. The 16CH e.g. has a usb3 port. So i would not recommend to mix it. The 16CH only costs 29,99$...