Hi. Please exercise caution when using Kingroot to root your Kyocera c6743. A friend of mine had success rooting his phone using this method after many tries. Then, his phone was temporarily bricked. I suspect the method isn't the issue so much as the phone itself being unable to keep root. He attempted only to remove bloatware (no system apps) when the phone lost root and powered down. It had to be reset several times before it would turn back on. He also tried rooting his phone via the port method. But, his phone would not recognize the Ministro II software that he installed. Very frustrating.
The best suggestion I can give is do some research into what make and model of phones people have had the most success with rooting, whether with or without pc, then find reliable step by step instructions to follow after you've purchased the best phone for yourself. Back up your data before attempting this. I've known people to be successful using "Kingoroot" on Android models other than the c6743. They were able to both root and keep root on their devices.
If I, myself, was to try rooting a phone, given what I've learned, it would be on anything other than the Kyocera Hydro. This is a waste of time and any prior modding you've done.