I have added few new IPC-HDW4231EM-ASE cams to my system. The web interface of the models made after 06-2019 works perfectly without NACL plugin. The web interface of the same models made 10-2018 works only with the NACL plugin. According their spec sheets there isn't any hardware difference between these models. I've upgraded their firmware to the latest version via their web interface and they have not updated their firmware to the same version: The firmware version of the model manufactured at 06-2019 is: 2.800.0000008.0.R.190619 The firmware version of model manufactured at 10-2018 is: 2.622.0000000.31.R. The model manufactured at 10-2018 say "it has the latest version" although it has an older firmware than the other model and I can not find where to download the latest firmware. What do you think are there any hardware differences between these models? Is it possible to upgrade the firmware of the older model to the newer version?