Working root method for Lenovo P2 Nougat(even with July security patch update)
Hi,
Found the working method.
1) Unlock bootloader if you haven't.
2) Install Latest twrp for Lenovo P2. Download that one from twrp.me. This is the one I've downloaded and installed (twrp-3.1.1-1-kuntao_row)
3) Before installing supersu, make sure to change the file system to ext4. Otherwise, it won't work and reboot to system after you've changed the file system and then again reboot to recovery.
4) Download supersu (SuperSU-v2.82-201705271822) and place it in the internal storage.
5) Swipe it and you are done. No need to give cache wipe or something.
Make sure to make a full system backup in twrp before making any changes to the system.
That's it. You've successfully rooted Lenovo P2.