I have 2, fresh from China, Dahua DH-IPC-HDW4421C cameras.  I find them in the Dahua config tool w/o issue.  But I can not modify their IP address.  They show up in the tool as 192.168.1.108.  I try to change them to my network (10.0.0.x) and all I get is "failed to modify ip".  I ordered 2 of...