Xperia Arc S ( LT18i ) Build Number .42 , .58 , .62 Root Firmware Unlock \\/\\/FREE\\\\\\
- A USB cable and a computer with Windows OS- Sony PC Companion software installed on the computer- Flashtool software downloaded from - The appropriate firmware package for your build number downloaded from - Backup your data and charge your battery **H2: Steps to Root and Unlock Xperia Arc S (LT18i)** **H3: Step 1: Enable USB Debugging and Unknown Sources on Your Phone**- Go to Settings > Applications > Development and check USB Debugging- Go to Settings > Applications and check Unknown Sources**H3: Step 2: Install Flashtool on Your Computer**- Extract the Flashtool zip file to a folder on your computer- Run Flashtool.exe and follow the instructions to install it- Copy the firmware package for your build number to the Flashtool folder**H3: Step 3: Flash the Firmware Package on Your Phone**- Turn off your phone and remove the battery for a few seconds- Put the battery back in and press and hold the Volume Down button- Connect your phone to your computer with the USB cable- Run Flashtool.exe and click on the Flash button- Select Flashmode and choose the firmware package for your build number- Click OK and wait for the flashing process to complete- Disconnect your phone from your computer and turn it on**H3: Step 4: Root Your Phone with SuperOneClick**- Download SuperOneClick from and extract it to a folder on your computer- Run SuperOneClick.exe and click on the Root button- Wait for the rooting process to complete- Reboot your phone**H3: Step 5: Unlock Your Bootloader with Fastboot**- Download Fastboot from and extract it to a folder on your computer- Turn off your phone and press and hold the Volume Up button- Connect your phone to your computer with the USB cable- Run Fastboot.exe and type in the following command:`fastboot.exe -i 0x0fce oem unlock 0xKEY`where KEY is the unlock code that you can get from by entering your IMEI number- Press Enter and wait for the unlocking process to complete- Reboot your phone **H2: Conclusion** Summarize the main points of the article, restate the benefits and risks of rooting and unlocking, provide some tips and warnings, invite feedback **H2: FAQs** Answer some common questions about rooting and unlocking Xperia Arc S (LT18i), such as:- How can I check my build number?- How can I restore my phone to stock firmware?- What are some custom ROMs that I can install on my rooted and unlocked phone?- How can I unroot my phone?- Will rooting and unlocking void my warranty? Article with HTML formatting: 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 might have encountered some difficulties depending on your build number. Some build numbers are easier to root and unlock than others, while some require different methods or tools.
Xperia Arc S ( LT18i ) Build Number .42 , .58 , .62 Root Firmware Unlock
In this article, we will show you how to root and unlock Xperia Arc S (LT18i) with different build numbers, namely 4.0.1.A.0.266, 4.0.1.A.0.283, 4.0.2.A.0.42, 4.0.2.A.0.58 or 4.0.2.A.0.62.
But first, let's explain what rooting and unlocking are, why you might want to do them, and what are the benefits and risks involved.
Rooting is the process of gaining full access to the system files and settings of your Android device, allowing you to modify them as you wish.
Unlocking is the process of removing the restrictions imposed by the manufacturer or carrier on your device's bootloader, allowing you to install custom ROMs or kernels that can enhance your device's performance or features.
Some of the benefits of rooting and unlocking are:
You can remove bloatware or unwanted apps that take up space or drain battery
You can install apps that require root access, such as Titanium Backup, AdAway, Greenify, etc.
You can customize your device's appearance or functionality with themes, launchers, widgets, etc.
You can overclock or underclock your device's CPU or GPU for better speed or battery life
You can update your device to newer Android versions that are not officially supported by Sony
Some of the risks of rooting and unlocking are:
You might lose your data or settings if you don't backup them properly
You might brick your device if you flash incompatible or corrupted files
You might void your warranty or lose official support from Sony
You might expose your device to security threats or malware if you download untrusted files or apps
Therefore, before you proceed with rooting and unlocking Xperia Arc S (LT18i), make sure you understand what you are doing, follow the instructions carefully, backup your data, charge your battery, and proceed at your own risk.
Requirements for Rooting and Unlocking Xperia Arc S (LT18i)
To root and unlock Xperia Arc S (LT18i) with different build numbers, you will need:
.62
A USB cable and a computer with Windows OS
Sony PC Companion software installed on the computer
Flashtool software downloaded from
The appropriate firmware package for your build number downloaded from
Backup your data and charge your battery
Steps to Root and Unlock Xperia Arc S (LT18i)
Step 1: Enable USB Debugging and Unknown Sources on Your Phone
The first step to root and unlock Xperia Arc S (LT18i) is to enable USB debugging and unknown sources on your phone. This will allow you to connect your phone to your computer and install apps from outside the Google Play Store.
To enable USB debugging and unknown sources, follow these steps:
Go to Settings > Applications > Development and check USB Debugging
Go to Settings > Applications and check Unknown Sources
Step 2: Install Flashtool on Your Computer
The next step to root and unlock Xperia Arc S (LT18i) is to install Flashtool on your computer. Flashtool is a software that can flash firmware packages on Sony devices.
To install Flashtool on your computer, follow these steps:
Extract the Flashtool zip file to a folder on your computer
Run Flashtool.exe and follow the instructions to install it
Copy the firmware package for your build number to the Flashtool folder
Step 3: Flash the Firmware Package on Your Phone
The third step to root and unlock Xperia Arc S (LT18i) is to flash the firmware package on your phone. This will update your phone's software to a version that can be rooted and unlocked.
To flash the firmware package on your phone, follow these steps:
Turn off your phone and remove the battery for a few seconds
Put the battery back in and press and hold the Volume Down button
Connect your phone to your computer with the USB cable
Run Flashtool.exe and click on the Flash button
Select Flashmode and choose the firmware package for your build number
Click OK and wait for the flashing process to complete
Disconnect your phone from your computer and turn it on
Step 4: Root Your Phone with SuperOneClick
The fourth step to root and unlock Xperia Arc S (LT18i) is to root your phone with SuperOneClick. SuperOneClick is a software that can root Android devices with one click.
To root your phone with SuperOneClick, follow these steps:
Download SuperOneClick from and extract it to a folder on your computer
Run SuperOneClick.exe and click on the Root button
Wait for the rooting process to complete
Reboot your phone
Step 5: Unlock Your Bootloader with Fastboot
The fifth and final step to root and unlock Xperia Arc S (LT18i) is to unlock your bootloader with Fastboot. Fastboot is a tool that can communicate with your device's bootloader and execute commands.
To unlock your bootloader with Fastboot, follow these steps:
Download Fastboot from and extract it to a folder on your computer
Turn off your phone and press and hold the Volume Up button
Connect your phone to your computer with the USB cable
Run Fastboot.exe and type in the following command:`fastboot.exe -i 0x0fce oem unlock 0xKEY`where KEY is the unlock code that you can get from by entering your IMEI number
Press Enter and wait for the unlocking process to complete
Reboot your phone
Conclusion
Congratulations! You have successfully rooted and unlocked Xperia Arc S (LT18i) with different build numbers. You can now enjoy the benefits of having full control over your device, such as installing custom ROMs or kernels, removing bloatware, or tweaking performance.
However, remember that rooting and unlocking also come with some risks, such as bricking your device, losing warranty, or exposing yourself to malware. Therefore, be careful when flashing files or downloading apps, backup your data regularly, and use antivirus software.
If you have any questions or feedback about this article, feel free to leave a comment below. We would love to hear from you!
FAQs
How can I check my build number?
You can check your build number by going to Settings > About Phone > Build Number. It should be one of these: 4.0.1.A.0.266, 4.0.1.A.0.283, 4.0.2.A.0.42, 4.0.2.A.0.58 or 4.0.2.A.0.62.
How can I restore my phone to stock firmware?
You can restore your phone to stock firmware by using Flashtool again and flashing the original firmware package for your build number that you can download from . This will unroot and relock your bootloader as well.
What are some custom ROMs that I can install on my rooted and unlocked phone?
There are many custom ROMs that you can install on your rooted and unlocked phone, depending on your preference and compatibility. Some of the popular ones are CyanogenMod, LineageOS, Resurrection Remix, AOSP Extended, etc. You can find them on or other forums.
How can I unroot my phone?
You can unroot your phone by using SuperOneClick again and clicking on the Unroot button. This will remove the root access from your device.
Will rooting and unlocking void my warranty?
Possibly yes. Rooting and unlocking may void your warranty or lose official support from Sony if they detect it. However, you may be able to restore it by flashing stock firmware or using tools like Triangle Away that can reset the flash counter.