I had a problem with one of Zmodo's cables the last couples of days. Lost connection very often.
Since I didn't have something to loose I tried to change it to usb - ethernet converter.
Cutting the cable and exposure the individual pins to attach a new RJ45 an easy process, however should be done with little care since it is thinner than the typical cat5e and the cover material is different. The attached pic shows you how it looks like to exposure the individual pins of your Zmodo cable.
Works pretty well. Therefore I made 4 micro usb- ethernet converters from Zmodo's cable and use my own (ethernet) cable to connect the cameras.