LG-F180L,K,S HOANG LAM OPTIMUS 3.1 Rom

Download Rom
First  Backup Your Current Rom Then Flash This Rom 
If You Want To Flash this Rom Your Mobile Must Be Rooted And Have Custom Recovery
Download This Rom And Copy Into Phone Memory
Now Go to CWM Or TWRP Recovery
And Do These Wipe
1- Factory Reset
2- Cache
3-Dalvik
Go Back On Main Page Of recovery
1- Install Zip From Sdcard
2-Choose Zip From Sdcard
Find The Rom And Click On It :)
Enjoy
First Startup Slow Wait 5 Minute

Don't Dorget to say Thanks

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