Lastly you'll need to connect to the motherboard of the NVR as shown in the pics for my setup. You'll need a TTL (not the higher voltage RS-232 version) UART USB dongle, a terminal program such as PuTTY or Tera Term or minicom, etc, set to 115K baud, no parity, one stop bit, 8 data bits. I took a couple of pictures to show how to restore the NVR via U-boot and a serial UART connection. Have a few other things on my plate at the moment. I will write a step by step post sometime this week and link it here using that recorder. What is remaining in my NVR stock from last year have already been bricked and firmware upgraded, so I'm not touching those again, but a friend of mine has a 7608 that is in need of a firmware upgrade which will result in a brick. It will not reboot after it's done, it requires hitting Enter in PuTTY over serial to finish it off (or a power cycle will work too). It will start the firmware recovery process once you hit enter. It will ask you to set an IP for the recorder, then specify the IP of your TFTP server (your computer). At this point, make sure your computer and recorder are both connected to your main network (no 192.0.0.128 necessary). Once U-boot is stopped, there are a few prompts asking you for info. You need to PuTTY over serial/TTL directly into the boot loader to manually halt it. NVRs on the other hand must be invoked manually. In any case, that is an automated process. (Sometimes the reboot doesn't happen I've found). If found, connect as client and attempt to pull digicap.dav, (The firmware), flash it, and reboot. IPCs have a version of U-Boot that within the first n seconds of power on, probe the network for a TFTP server at 192.0.0.128. While they still require TFTP for the transfer of the firmware itself, it's not automated like the IP cameras are. I've recovered many of these NVRs (the 3.1.x to 3.4.x upgrade bricks them every time) and all of them appear to be the same. It's a fairly straightforward recovery process once everything is set up correctly. Power on the camera, set the IPs accordingly, and done. With IP cameras, simply throwing up the Hikvision TFTP server with the proper firmware loaded into that directory is sufficient. A TTL-level serial connection (not RS-232 level) is required to unbrick these devices via the white 4-pin UART connector on the main logic board. Hikvision NVRs do not respond to TFTP in the same manner as IPCs.
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