New official firmware 4.0.2.A.0.62 released for your Sony Xperia Arc that based on Android 2.3.4 Gingerbread. The firmware has new features, fixes and customizations. Mostly people have upgraded their devices with this firmware through OTA, but if you haven’t, you can install it manually on your Sony Xperia Arc LT15i.
Here’s guide for you to install it manually on your Sony Xperia Arc LT15i, just first make a backup of your device data such as SMS, internet setting, contacts music files etc because the below procedure may wipe data, you can sync your contacts with Gmail account and for messages use SMS apps, lastly use file expert app to backup to back apps and and turn the USB Debugging on, to do so just tap Menu> Settings> Application> Development.
DISCLAIMER: Please proceed the below guide at your own risk, Android Egis will not be held responsible if your device lost data or get damaged following this guide.
Step #1: Download Flashtool to PC and install it on PC.
Step #2: Open C drive from My Computer, go to Flashtool folder and then drivers folder
Step #3: Run Flashtool-drivers file, it’ll automatically install drivers on PC.
Step #4: Now on drivers set-up screen, click on Next, then you’ll see component selection, you just select “Arc-Play-New-Acro ADB Drivers” and “Flashmod Drivers.”
Step #5: Click on Next button, it will install ADB drivers.
Step #6: Once the above process is done, download Android 2.3.44 firmware to PC and copy it to the Flashtool\firmwares folder.
Step #7: Open Flashtool folder and run FlashTool file.
Step #8: Click on Flash button and select Flashmode.
Step #9: A list of devices will open, select LT15i from them.
Step #10: Hold down back button of phone and plug it to PC using USB cable. Flashtool app will start installation.
Step #11: Once installation done, a message saying “Flashing complete” will appear. That’s now unplug the device from PC and reboot it. Enjoy!
Credited Via: XDA