How to Root and Unlock Xperia Arc S (LT18i) with Different Build Numbers
If you have a Sony Ericsson Xperia Arc S (LT18i) smartphone and want to root it or unlock its bootloader, you may find it difficult to do so if your device has a different build number than the usual ones. In this article, we will show you how to root and unlock your Xperia Arc S (LT18i) with build numbers .42, .58, or .62.
What is Rooting and Unlocking
Rooting is the process of gaining full access to the system files and settings of your Android device. This allows you to customize your device, install custom ROMs, remove bloatware, and perform other advanced tasks. Unlocking is the process of removing the restrictions imposed by the manufacturer or carrier on your device. This allows you to use your device with any SIM card, install custom kernels, and flash custom recovery.
Why Root and Unlock Xperia Arc S (LT18i)
The Xperia Arc S (LT18i) is a powerful and stylish smartphone that was released in 2011. It has a 4.2-inch display, a 1.4 GHz processor, an 8 MP camera, and runs on Android 4.0.4 Ice Cream Sandwich. However, some users may want to root and unlock their device to enjoy more features and performance. For example, rooting and unlocking can help you:
Install custom ROMs that offer better UI, functionality, and battery life.
Remove unwanted apps and services that consume memory and resources.
Backup and restore your data and apps using tools like Titanium Backup.
Overclock or underclock your CPU and GPU to improve speed or battery life.
Install apps that require root access, such as AdAway, Greenify, or Xposed Framework.
How to Root and Unlock Xperia Arc S (LT18i) with Build Numbers .42, .58, or .62
The rooting and unlocking process for Xperia Arc S (LT18i) with different build numbers is not very different from the standard one. However, you will need to use specific files and tools for each build number. Here are the steps you need to follow:
Backup your data and apps using a tool like Helium or SyncDroid.
Download the appropriate firmware file for your build number from here. You will need a file with a .ftf extension.
Download Flashtool from here and install it on your PC.
Copy the firmware file to the Flashtool/firmwares folder on your PC.
Run Flashtool as administrator and click on the lightning icon.
Select Flashmode and choose the firmware file you copied earlier.
Click OK and follow the instructions on the screen to flash the firmware on your device.
Your device will reboot after flashing. Do not disconnect it from the PC yet.
Download Doomlord's Easy Rooting Toolkit from here and extract it on your PC.
Run runme.bat as administrator and follow the instructions on the screen to root your device.
Your device will reboot again after rooting. You can now disconnect it from the PC.
To unlock your bootloader, go to this website and follow the steps there. You will need your IMEI number, which you can find by dialing *#06# on your device.
You will receive an unlock code via email. Copy it and save it somewhere.