The LG Optimus 4X HD was the Korean’s companies high-end Android offering for a short while during the middle of last year. The Optimus 4X HD was a fine device by all means, but it had some terrible issues that led to it failing miserably.
Back in the first week of February, LG had confirmed that the Jelly Bean update for the Optimus 4X HD is nearly ready and is in the final stages of testing. While LG is yet to roll-out the update, the first Jelly Bean based firmware for the handset has leaked online. The leaked firmware includes all the Android 4.1 goodness including Project Butter, Google Now and an enhanced notification bar.
The leaked firmware has also allowed the Optimus 4X HD developers to unlock its bootloader, which should considerably make it easier to developer custom ROMs and kernels for the device. Keep in mind that the process of installing the leaked firmware on the Optimus 4X HD are not as simple as it is for other devices. So, if you are not well versed with the whole modding scene of the device, I would suggest you to wait for the official update that should be here in about a month or so.
Head over to this XDA thread for the download link of the firmware and other information.
Via – Android Central