Okay, very good to hear!@cor35vet, When they rejected the FW you posted originally, they would reboot, do go through the reboot prcess, IR ilumminates, lens motor clicks and work no problem afterwards, no stuck in bootloop, do respond to pings BUT they just don't respond to TELNET, telnet is already set to enable in each camera but keeps getting port 23 no response BS error, that's why i don't get it, tried on other PCs, same BS error..
As I said before I've made a custom firmware (patches only user and custom partition) for HDBW4431R-ZS, which software version do you have - best make a screenshot of the version page.
If you have the latest chinese version on your cam I can send you my custom fw that you can flash over it and your cams should be english,french,spanish.