0. Install driver on pc before doing any thing.
1. Extract recovery and scatter file in the same folder on desktop.
2. Start SPFlash Tool and select scatter file from the extracted folder.
[Note in SPFlash Tool only recovery option should be selected.]
3. Shutdown the phone and remove battery.
4. In SPFlash Tool click on Download button and then connect you phone, wait for a few sec and then you'll see the green which means CWM recovery has been flashed.
Recovery and scatter file
SPFlash Tool V3
You have successfully installed CWM Recovery in Micromax Viva A72
Use it on your own RISK.
I or any other should not be held responsible for any damage to your phone, to you or to your brain