Ok. After reading the IPC Easy Unbricking thread I have made a file using that method that should allow someone with an A46 to get the web UI back without needing to get a serial TTL adapter or opening the camera up. You need to read the start of this other thread here >
Dahua IPC EASY unbricking / recovery over TFTP
After reading that be aware. You MUST follow the instructions in Step 1. Then download the attached zip file. Credit goes to
@cor35vet and
@resegun for figuring much of this out. I've simply taken the download from the start of Step 2 in the above thread, added the web UI part of the firmware, edited the command.txt and run command.bat to generate the recovery file. The way this is configured it will ONLY install the web UI part of the older firmware and does not change the current firmware. Follow Step 1 from the thread I linked above. On Step 2 use the file attached to this post. Download it, and extract it to a folder on your hard drive. Open a command prompt (not sure if you need to open it as administrator or not) and proceed to Step 3 of the thread I linked above. After its done and you reset your network back to normal setting and reset the A46 you should have the web UI back.