It is safe to say that you are
going to redesign your Android OS? Did you realize that attempting to upgrade rooted android telephone will prompt your phone to get bricked? So with regards to upgrading android OS if your telephone is rooted you have to unroot it before you can continue to updating process.

5 STEPS TO UNROOT YOUR ROOTED ANDROID DEVICE:
1. Open your king root on your
device and click on menu icon
at the top then click General
setting.

2. Under General settings scroll
down to uninstall kingroot and click on it to removed Root permission.

3. A pop up will come out saying
that you will lost root access
just click Continue.
Unrooting process with KingRoot

4. Another pop up will appears
again just press OK to remove the root authorisation.
Prompt to remove root authorisation

5. Now wait for few seconds for
the process to complete.

That's all. When the process complete successfully, you will notice that.the kingroot will NO LONGER BE on your device which mean you don't have any root access on your device
anymore.

source: http://techpaded.com.ng