Why unroot your android device?
Once an android user attempts to optimize his android device's capability, rooting android is always a frequent recommendation as it can allow modifications to the system software of any android device, whether a phone or a tablet. But, there are cases that you need to bring your android device to its service center for tuneup or whenever there's somethings gone wrong with the device out of the box and you need to unroot it to restore its warranty. When you are in a situation like that, this article might help you.
How to Unroot Any Android Device
Before anything else, backup your ROM first just to be safe.
Manually Unroot Any Android Device
1. Download and install any file explorer/manager on your device which is capable of accessing the root system. For those who doesn't have one, here's ES File Explorer which is a free downloadable app from Google Play Store.
2. Open ES File Explorer or any similar app.
3. From the ES File Explorer or any similar app, tap on the slash symbol "/", but if you are using Root Explorer, tap on the the plus button "+" below and select Root Tab or something like that. If it asks you for root access, grant it.
Now we need to delete the su file from bin or xbin folder.
4. Now, go to System > Bin > folder and find the su file, if there's any, delete it. If there's none, proceed to step 5.
5. Go back to System folder and open the Xbin folder. Find the su file and delete it.
6. Navigate back to System folder and delete the superuser app you are using. Delete either Superuser.apk or SuperSU.apk.
Unroot Any Android Device with SuperSU
1. Open SuperSU app from your phone's app drawer or app list.
2. Navigate to Settings tab.
3. Find and select Full unroot.
4. Let the app to process your request. Done!
Unrooting Any Android Device using Framaroot
If you have used Framaroot to root your android device, you can use it too for unrooting it. This works especially when you have Qualcomm, MTK-based android device, etc..
1. Download and install Framaroot in your android device.
2. Select Unroot.
3. Click Boromir for MTK-based, Gandalf for Qualcomm-based, Aragorn for Samsung,
4. Wait and you are done.