Starting today T-Mobile is pushing out KitKat to LG G Flex owners. It is software version D95920d, weighs in at 147MB, and brings KitKat
4.4.3(4.4.2 see below). It is also packing the prerequisite “bug fixes” as well as LG’s KnockCode. You know the drill: head to System Settings > General > System > About Phone > System updates > Check now.
Edit: T-Mobile has pulled the page after incorrectly listing the version of KitKat as 4.4.3. The update brings th LG G Flex to KitKat 4.4.2.