Default [Q] LG G2 D803 Help

I have my friend lg g2 D803 who messed it up somehow. So now it runs on that nexus type of android version. No new features can be used and the device is rooted. Boot up time is slow and i don't know to get out of the root now.
I wanted to get back to 4.2.2 or 4.3 jelly bean rather then 4.4.2 kitkat.
It shows baseband/imei/imei sv/ ip address/ wi-fi mac address/ Bluetooth address is Unknown.
kernel version: 3.4.83-kitkat
houstonn@aospa #1
tue mar 18 21:45:00 EDT 2014
Build Number: pa_d803-userdebug 4.4.2 KVT49L
eng.houstonn.20140318.213743 test-keys.
Need help to get to jelly bean and with out root so i can use the original firmware like it came out with all features. I don't like nexus type interface.
Also it has cyanogenmod and clockworkmod recovery.
Thanks to anyone who can help.