MrSonei6 0 Posted September 4, 2020 Hello i Have a dahua Video Dorbell and bought a second VTH Monitor But the monitor has a newer FW 4.0 with SIP and my first indor Monitor has a 3.2 Firmware without sip I get an error if I install the 3.2 FW on the newer Monitor The new VTH Monitor is vth1550ch-s2 (4.0FW) The old is vth1510ch (3.2FW) can someone help me? Share this post Link to post Share on other sites
