Unrooting is the process of turning back a device, whether it may be a Smartphone or a Tablet, back to its original stock official firmware. Unrooting is useful especially when it comes to warranty issues such as defective hardware. Service Centers wouldn’t cater customers who have rooted devices as the customer would have violated the warranty agreement. Okay, don’t panic if you’ve got a rooted device. It’s basic and effortless in unrooting a devie.
Note: This guide is intended for the Samsung Galaxy S2 i9100, the international unlocked version and not the AT&T, Verizon or T-Mobile versions.
- Rooted Samsung Galaxy S2 i9100, either with a custom ROM or not
- Odin 1.85
- Samsung Kies
- Official Samsung Galaxy S2 i9100 Firmware (You can search for your country’s firmware or you can use a the Polish Firmware which is updated)
- Download Odin 1.85 and Samsung Kies. Once done, head over here to download your country’s official Samsung Galaxy S2 i9100 firmware. Moreover, if your Smartphone came locked on a specific network carrier you can find it from the list too. Alternatively, you can download the Polish firmware as it’s updated. Don’t forget to extract the contents of the zip file to a folder. If you’re from the Philippines, you can download the official ICS Firmware (I9100DXLP7_I9100OLBLP7_XTC).
- Switch off your Samsung Galaxy S2 and put it in Download Mode by pressing Volume Down + Menu Button + Power Button.
- Connect your Galaxy S2 to your computer with the Micro-USB cable. Press the Volume Up button to enter Download Mode.
- Run Odin, click on PDA and look for the extracted folder of the official stock firmware. We’re looking for a particular filename with the following format – “I9100DXLP7_I9100OLBLP7_XTC.tar”.
- Click Start and give it a few minutes for it to flash the official Samsung stock firmware to your Samsung Galaxy S2. The device would automatically restart too.
- If you are coming from a custom ROM or Kernel it would usually get stuck at the Samsung boot screen. This is normal due to platform issues. Nevertheless, remove the battery from the Galaxy S2 and disconnect all cables. Insert the battery back in and instead of turning it on, access Recovery Mode by pressing Volume Up + Menu Button + Power Button for 10 seconds. The screen would flash twice.
- Once in Recovery Mode, do a Wipe Data/Factory Reset and Wipe Cache Partition. Lastly, reboot your phone and everything should be in working order.
If you got yourself into a problem, feel free to ask below. If you are a little bit hesitant to the above process, ask your questions below. I’ll be more than happy to answer them.