Samsung Galaxy Note 2 was launched in 2012 after the success of Galaxy Note. It has a huge 5.5″ Super AMOLED screen with a resolution of 720×1280 pixels. It has a Quadcore 1.60GHz Exynos 4412 processor, 2GB of RAM. When it was released, it ran on Android 4.1.1 Jelly Bean OS.
Galaxy Note 2 has got the official Lollipop update in some regions but not all regions have got it. Android Lollipop can be installed on the Note 2 using custom ROM. Many custom ROMs are available for the Note 2 but the most famous one is the CM 12.1. This ROM will update the Note 2 to Android 5.1. Follow the guide below.