U need not to unroot
make sure u have stock recovery that's it
it's same model that i have so go ahead without any worries
flashing of kitkat rom available is not necessary for upgrading to lollipop, you only need a 70 mb update before upgradi...
hi guys and girls .
i was trying to root my htc desire 820 with the WinDroid-Universal-Android-Toolkit
i was able to successfully unlock the bootloder and instal the twrp recovery .
but then when i tried to flash the super user and root it .
Yea i know where is it but What does it mean? Is it security for change software ?
It means that you have modified system files.So you cannot apply official ota system update until you revert your phone to stock.