How to Flash IMG Files on Rooted Android with Flashify App! [Root Apps]

For rooted Android smartphones and tablets, sometimes you may need to flash IMG files (files ending in .img).  Whether you are flashing recovery image such as CWM or TWRP recovery or flashing boot image, it’s always a complicated task involving fastboot command with a computer OR terminal emulator with dd commands.
Now, there’s an easier way to flash img files on any rooted Android device using an app called Flashify.  I ran into this problem while trying to flash a modded version of TWRP on my HTC One.  I wanted to find an easier way for users to install IMG files instead of using fastboot.  Also, there are many times when GooManager app doesn’t work and fails to install TWRP recovery.