Zmodo uses proprietary cables and POE technology. They do not use a Standard like most companies. So you will have to buy a cable Directly from Zmodo for this. If you think the USB-C end is good and it is just the RJ45 end, then you can cut that and put on a new end with a simple RJ45 tool. or find the break in the line using a TDR for Ethernet and find the break. if it is in the USB-C end, like in the connector it's self, you may be stuck buying the cable from Zmodo. Mine has RJ45 on both ends but it is what they call "Simplified" POE, which means that i can not use a POE switch to help limit the amount of wires running around the home. But they do not allow this. Since I have all of the tools I was able to make long enough cables but still having to run home run to every camera sucks. it limits the amount of power that can go down long cables. even Zmodo will not support the length of wire that i have ran, but i do not have a choice since they do care to use standard technology and make it easier for their customer. they only care about their profit margin and what they can squeeze out of peoples pockets.
Sorry for the Rant, but, point is you will need to buy directly from Zmodo for that cable. I firmly believe they did the RJ45 to USB-C because you can no longer make your own cables. welcome to a company that does not care.