No Name China DVR Password Reset. Help Needed

Hello

I got my hand a DVR from China (probably) which I need to reset the password.

I tried suggestions like: 666666, 888888, etc..

I got a S/N on the back of the DVR which is: JA2004130100009812

There are some pics from the login page (VGA connected) and front of the DVR cover

If any can help me on how can I reset the password via a tool or something similar I would be so thankful

Please upload web login picture