Thank you iTuneDVR...I was just reading the post RE using TTL. I didn't know about trying the old ConfigTool...happen to know what version or where to get the right one?
So I tried to flash this camera with the latest Dahua equivalent firmware but unfortunately it won't take the firmware update and just reboots back with the original firmware. Similar to what the NVR does. Q-see must have put some firmware checks in place to prevent this from happening.
I also found an older firmware file that includes the update.img file that may be what you need?
oldDH_NVR5XXX-4KS2_Eng_V3.215.0000000.3.R.20171211.zip