"1st, Go to Your 3845#*801#
(Change according to your model)
Then Settings and then Version Info..
SW Version Info
Sub SW Version
AP App Version
Should be Implemented
#1 SMP PREEMPT Mon Feb 3 17:25:05 KST
If you have "Baseband Should be implemented"
Download All Flashable modems.
Root your phone, Install Custom Recovery.
Flash All modems one by one.
After each Flash clear cache, Dalvik, Factory reset and check your Baseband and IMEI.
When it returns, take an EFS backup and then you can proceed further with flashing..
I have rectified mine and 4 other users issue with this method.
Note: This is my own findings. Don't include it in any thread without my permission..
Donate me. If I saved your mobile..
Sent from My LG G Flex LG-F340K Stock KitKat V20D on LTE Network using XDA Free Mobile app