If you have screwed up your T-Mobile Galaxy S2 (SGH-T989), and would like to unroot and restore back to factory state so that you can claim the warranty, you have ended up at the right place. Just a while ago, developer “zedomax” of XDA has come up with a CWM flashable zip file that makes the restoring process to go smooth without a hurdle.
We now bring you step-by-step guide to unroot and restore your SGH-T989 to factory state.
Caution: Note that when we say bringing the phone to the factory state, it means clean wipe of phone data. Therefore, it is important to take a backup of phone data before you go ahead with the process.
1. Connect the SGH-T989 to computer via USB cable.
2. Copy the downloaded zip file to the phone’s internal memory or SD card memory.
3. Disconnect the USB connection after the copying is complete.
4. Power off the phone and boot into ClockworkMod Recovery. You can do it by pressing Volume Up/Down Key and Power button together. Alternatively, you can use ROM Manager app to boot into CWM Recovery.
5. In ClockworkMod Recovery mode, select “Wipe data /factory reset”. Use Volume keys to navigate and Power button to select the option.
6. Go back and select “Install zip from SD Card”.
7. Select “Choose zip from sd card”.
8. Navigate to the file that you copied earlier in STEP 2 (SGH-T989-UnRoot_ROM_Zedomax.zip) and select “Yes”.
9. Wait for the installation to finish.
After the installation is complete, the phone will reboot automatically into the stock firmware.
Below is the video guide from the Developer.