Earlier today, Sprint has begun rolling out the KitKat update to their LG G Flex devices. This update will bring the software version up to LS995ZV6. According to Sprint, this will be a OTA update so you just have to wait for the update notification to hit your device. Similarly, Sprint also mentioned that a Knock Code update will also be released somewhere next week.
This KitKat update will be rolled out in batches starting today, and is expected to complete by May 7th next week. You can learn more about the update here if you’re interested.
Source : Sprint