How to root the Samsung Galaxy Note5 (SM-N920T & N920P) and install custom recovery
Jailbreaking the Samsung Galaxy Note5 isn't difficult. It boils down to flashing Manh_IT's Noble Kernel, which is the first kernel for the device to support auto-rooting, BusyBox, and a deep sleep fix. You shouldn't lose any personal date from your phone, but be sure to make a full back-up, just in case. Also, there's a pretty good chance Samsung Pay and the KNOX security system will cease working, as rooting the smartphone compromises its protection. Finally, Noble Kernel only works on SM-N920T and SM-N920P variants of the smartphone, while SM-N920I and SM-N920W8 ports are being tested, so check your Note5's model number beforehand!
With this in mind, let's get "power user" on the Note5! First, download the appropriate kernel for your phablet on your computer: N920T or N920P. Then, download Odin 3.10.7 (link). This is Samsung's phone flash tool, and we'll be putting it to good use here.
So, go ahead and extract the Noble Kernel and Odin zip files. Launch Odin and click on the AP button. Choose the folder that contains your extracted Noble Kernel. Then, power off your Note5, and press the volume down, power, and home buttons at the same time to put the phone into Download Mode. Now, connect the Note5 to your PC and click the Start button in Odin. Noble Kernel will get flashed, your phablet will be rebooted, and all that's left is to install SuperSU from Google Play. You will gain root access after updating the SuperSU binary.
Next up, installing TWRP. First, download TWRP 184.108.40.206 for SM-N920T/N920P from this link. Then, start Odin, click AP, and choose the tar.md5 file. Connect the Note5 to your PC and click start. You don't have to power it off or do anything special. When the process is finished, turn off the Note5 and press the volume up, home, and power buttons to boot into TWRP recovery. There you go, hope that works for you!