How to install TWRP recovery on any Android phone or tablet without a Computer - Official TWRP App
In today's short tutorial you'll find out how to flash TWRP custom recovery without using a computer or even having to boot to recovery, using the Official TWRP App.
Your device should be rooted. You can see the list of supported phones and tablets, together with download links here: https://twrp.me/Devices/
For devices not supported above, you can try: https://forum.xda-developers.com/
Download the app from here: https://goo.gl/Zk1NDU
Remember: anything you do to your phone or on your phone is your own responsibility. ;-)
How to root android phone link :-https://youtu.be/6o-YQGHkDOo