How to downgrade my device to the previous version?

How to downgrade my device to the previous version:

Not everyone likes the updates given in the devices. Some feel like downgrading to previous versions but a question that hits there mind is, How shall I downgrade my device?
Everyone tells about upgrading your device but no one tells how to downgrade your device version. Even you are worried about how to downgrade your device then you are at the right place.

Follow the below steps:

Unlock the Bootloader (If it is locked).
Firstly you need to install a custom recovery compatible with your device.
Download a custom ROM or Stock ROM which is compatible with your device.
Select the Android version you wish to downgrade to.
Save the downloaded ROM on your device or on your SD Card.
Now restart or reboot your phone into android recovery mode. Format and clear the cache, also the Dalvik cache.
Search the path where you have stored your downloaded ROM.
Select the downloaded ROM and install it.
Restart your phone.

Note: If you're installing custom ROM then you would lose your mobile warranty.

If you have installed the compatible ROM, then there's shouldn't be any kind of problem.

While performing these steps be very careful. *Do it at your own risk.

Any queries feel free to comment down.