Samsung Galaxy Note 3 has a 5.7″ Super AMOLED 1080p display. It is powered by a 2.3GHz Snapdragon 800 processor, with 3GB of RAM. Storage comes in at 32GB or 64GB, which can also be expanded with a 64GB microSd card. The camera is an impressive 13MP and is capable of capturing 4K video. The Galaxy Note 3 retains the S Pen stylus, and is the first smartphone to include support for USB 3.0. All this is powered by a 3200mAh battery.
Android 6.0 Marshmallow has been rolled out only for a few devices. There is CM 13 ROM available for Galaxy Note 3 which will update the device to Android 6.0. ROM is still in experimental stages but it is quite stable. Follow the guide below.