Please First State Your Device And What Official Version You Already Have. 

LG have released fantastic devices with hardware that has the ability to support android versions well above their stock 4.1.2 release. Many devices are in need of a revamp and the hardware is being wasted, this means other competitiors are taking over, such as HTC and Samsung as they are still updating officially their devices from the same time such as the Galaxy S3. This is for all LG Flagship Devices. http://www.cellsea.com/phones/lists/LG for a list of LG Devices.  With the release of KitKat and its ability to run at 512mb ram its not gonna be a problem of outdated hardware. However a 4.3 or 4.4 update isnt too much for ask for is it?