Hello all, 
  
I am facing this issue :  
I have a Dahua DVR with some users account, all have forgotten their passwords..     
  
I can enter locally with super admin password   . User's password may be changed then but after a power reset, the OLD configuration is coming back, ever and ever with unknown passwords. 
  
Battery has been removed for 20 minutes, factory reset done, no way   . Still the old config. appearing with network, accounts etc. I have found nothing regarding automatic config backup. 
  
Interestingly enough, when I successfully change the password, the following message issue : 
<< Sauvegarde config. arrêtée >> wich means "Configuration backup stopped" 
as if the new configuration could not be saved. 
  
Please anybody had this kind of behavior before ? 
  
Thanks a lot 
  
Patrice