Here's a guide for you to root your Galaxy Note 4. This guide works for all Jelly Bean Android 4.3, KitKat Android 4.4.2, 4.4.4, and Lollipop Android 5.0, 5.0.1, and 5.0.2. For KitKat/Lollipop, make sure you use the updated CWM recovery instead. .For those of you who want to root your Galaxy Note 4 and also install CWM or TWRP recovery at the same time (to install ROMs), you can use the CWM/TWRP root method for rooting. This root method works on all KitKat and Lollipop including Android 4.4.4, 5.0, 5.0.1, 5.0.2.
For those of you who want to get the latest Android Update on your Galaxy Note 4, check out the latest CM13 ROM with Android 6.0 Marshmallow. Based on latest Android 6.0, this ROM brings you the best of CM13 with all of it's customizations. Out of the box, you will get all of the latest Android Marshmallow features along with CM13 features like AudioFX, CM themes (compatible with all CM13 themes), and more.
For those of you looking to upgrade to the Note-5 , try the DN5 Rom on your Galaxy Note -4. Every is working out of the box , including network, data, wifi. You also get a working camera. You get a lot of features similar to the Note-5,including the S-Pen Air Command Window,and Screen Off Memo Feature. You also get some s6 edge features,such as the people and app edge.