How do i flash my android device ROM to uninstall King root 4.8.0? My android device is a Huawei Ascend G7-L01
I downloaded King root 4.8.0 like one year ago,when i was fed up of it,it tried to uninstall it,didn't work claiming that it is a system app,then i did a factory reset,did't work again,then i tried to uninstall it inside the app itself and it said 'removing failed feedback',didn't work again, and i disabled it but it does still affect the phone and it is annoying ,then many people were suggesting flash the android device ROM...........

My problem here is i don't know if it will really work and how to use it , can you guys please specify your answer ?
Download ES File explorer, grant it root permissions and:

 1. Delete the app from /system/app/Kingroot
 2. Delete the su file from /system/bin
 3. Reboot the phone


That is if you can't do just as my friend already told you