LG G Flex receives Android 4.4.2 KitKat update with Knock Code
Users can now enjoy LG's Knock Code feature as well as improvements to the Bluetooth Car-Kit. It will now display notifications as new messages arrive in addition to album art when playing music.
Sadly, the changelog of the update doesn't mention 4K video recording as it was previously rumored. Here's hoping we see it later down the road as a part of another software update.
To get the update, head head over to LG upgrade center and check Phone version upgrade to see if LG has started seeding it for your particular device.