LG G2 is the successor to the 2012 Optimus G and 2013 Optius G Pro. The G2 is powered by a 2.26GHz quad-core Snapdragon 800 processor, with 2GB of RAM. The IPS display of the G2 comes in at 5.2″ with a 1080p resolution. Internal storage comes in 16GB or 32GB, which is not expandable. The G2 utilizes advanced audio hardware to support 24-bit/192KHz audio. The G2 has a 13MP rear facing camera, and is powered by a non-removable 3000mAh battery.
After LG G2, two new flagships have been released by LG. So they will concentrate on those devices for Android Marshmallow update. It might take a while for LG G2 to get the official update. Till then, you can use CM 13 custom ROM running on Android 6.0. Follow the guide below to install it on LG G2.