Question [Q] Problem to return to JB stock ROM after KK rom

Hi everyone,

First of all, I apologize if somebody else asks this question but a have a problem and i didn't find a solution in the forum :

I have installed The German Vodafone KK rom (32gb version of the d802) and it works perfectly. But I've made a custom LgCamera apk , I want to paste it on the /system/priv-app directory but I'm not ROOT

I would like to return to the JB rom (with LG flash tool) to Root it with ioroot22 and then to reinstall KK to be root in kitkat. But the phone stucks in boot logo ( the LG one).

So someone have a solution to return in JB stock rom after a KK stock rom ??

Thanks in advance

Edit : To solve this problem, you have to make a hard reset. I keep this post for people who need this solution.