How to uninstall Kingroot 4.9.2

hi there, its so annoying that i already rooted by kingroot 4.9.2 but everytime i restart my phone the root are gone it return to stock. i used several script and instructions how to chane kingroit to suoer su but no luck.

now i ask for your help, how can i uninstall thet effin kingroot or is there any way for me to change it to super su?

i tried supersu-me but it force close. then using terminal emulator but "connection to ui timeout every attemp...

my device info

nexus 5
android v6.0.1
stock everything
roited once or thrice but return after rebooting device.

thanks in advance

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