These are the instructions to root Karbonn A9 Plus (running on android 4.0) Smartphone using vRoot Application on Windows Computer.
Requirements: Your Karbonn A9 Plus Smartphone should have 30-40 percent of phone battery to perform the rooting process.
Step 1: Enable USB Debugging on your Smartphone. To enable USB Debugging: Open Settings > Developers Option > USB Debugging > Tick to enable.
(Developers Option is hidden for Android 4.2.2 or above, to unhide Go to Settings > About Phone > Built Number (Tap on it for 5-8 times).
Step 2: Download and install vRoot application on your Windows Computer.
Step 3: Once vRoot Application is installed on your Computer, Open It.
Step 4: Once vRoot Application is launched, connect your Smartphone to the computer.
Step 5: Once Your Smartphone is connected successfully to the computer, vRoot Application will automatically detect your Smartphone.
Step 6: Now, Click on the “Root” button to begin the rooting process.
Step 7: Now, vRoot Application will automatically “Reboot” your Smartphone and install the SuperSU Application.
Step 8: Now your Smartphone is Rooted. To check whether your phone is rooted correctly, open Applications Menu, there you will be able to see a new app installed, called SuperSU. If this app exist then it means you have successfully rooted your device.
Optional: You can also verify the root status of your device by using the Root Checker Application.
[*] No data loss process: Your Karbonn A9 Plus Phone Data like contacts, pictures, videos, music and etc will be not affected with this method.
[*] Warranty Void: Your Karbonn A9 Plus Warranty may be Void after following the above tutorial.
[*] How to unroot? To unroot, Download Supersu (chainfire) from Playstore, then Open it. After that, In SuperSU open Settings > Full Unroot.
[*] Karbonn Stock Firmware: If you are looking for the original Stock Firmware then head over to the Karbonn Stock Firmware page.
[*] Karbonn USB Driver: If you are looking for the original usb driver then head over to the Download Karbonn USB Driver page.
[*] Credits: vRoot Application was created by Shenzhen (Developer). So full credits goes to them for sharing the application for free.