Samsung Galaxy Note has a large 5.3″ WXGA Pentile HD Super AMOLED display that sets it apart from other phones and tablets. In addition to the 1.4 GHz dual-core Exynos 4210 processor, full gigabyte of RAM, and 16 or 32 gigs of storage, the Note also packs active digitizer support dubbed S Pen, which uses pressure-sensitive Wacom technology.
Galaxy Note is more than 3 years old now so Samsung has stopped the official support for this phone. Although it has the specs to support the latest Android 5.0 Lollipop, Samsung wont provide the OTA for it. This is where CM 12 ROM comes to the rescue. You can update your Note to the latest Android version by installing the CM 12 custom ROM. Follow the guide given below.