EMC2

I have this same problem with a newer 4300C and have an older 4300C that updates just fine. Somewhere in the hardware development timeline they must have changed so that cameras revert to the prior firmware version automatically, which is good so your camera won't brick, but bad because it's impossible to upgrade. Wish I knew. You've taken the troubleshooting steps farther than I have with monitoring the upgrade process via telnet. If you keep digging please keep us posted on findings.

Has anyone figured out why some of these Dahua cameras won't accept formware updates? I have 2 HDW4300C's, one made in 2014 and one made in 2015, and the 2015 camera always says "file mismatch upgrade failed" whenever I attempt to flash the firmware. Doesn't matter which version of firmware (NTSC or PAL).

Well this is perplexing. I have had a Dahua HDW4300C for a year and have been able to upgrade it using the General_IPC-HX5(4)XXX-Adreia_Eng_P_Stream3_V2.420.0009.0.R.20151106.bin driver and several previous versions of this driver successfully, either through the web interface or using the configuration tool on port 3800. This camera has a manufacturer date of 2014-10. I recently installed another new Dahua HDW4300C with a manufacturer date of 2015-07. I have attempted upgrading firmware using the config tool on port 3800 as well as the web interface and no matter which driver I use (either the NTSC or PAL versions) it always says upgrade failed and reboots to the original firmware version. Why won't this camera upgrade successfully? Did Dahua change something in 2015 that prevents firmware upgrade?