No Root: How To Install TWRP Custom Recovery On Android Device

How To Install TWRP Custom Recovery On Any
Android Phone (Without Root)

Link 1:
Compatible devices:

Link 2:
SDK Platform tools

Link 3:
TWRP img file download

For ROMS

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What you should do before Flashing the TWRP

Unlock the bootloader of Android device.
Only you have unlocked the bootloader of the device, flashing the TWRP recovery is available. Most bootloaders are locked, as well as encrypted to make sure users stick to the Android OS version manufactured by the developers.

Download a compatible version of TWRP.
Make sure that the version of TWRP is applicable to your Android in case of any device specific quirks. Do a little reach on the TWRP website.

Install Android Debug Bridge ( ADB ).
If you have unlocked the bootloader, you may already have them. If not, you had better download one.

Backup.
Although flashing the TWRP will not wipe up the data, backup is always important when you do something with the system.