Android: Using Flashtool to restore stock Sony Xperia Arc/Arc S to stock firmware/kernel/etc
This guide is for the Sony Xperia Arc and the Sony Xperia Arc S.
This works with both LOCKED and UNLOCKED bootloaders.
However, this process is more suitable to locked bootloaders, because if you have an unlocked bootloader, you can just use Sony’s Official Flash Tool
Firmware 4.1.B.0.587, 4.1.B.0.431 or 4.0.2.A.0.62
Prerequisites:
- ADB Drivers for Xperia Arc/Arc S
- Flashtool 0.9.9.0
- Xperia Stock Firmware either 4.1.B.0.587, 4.1.B.0.431 or 4.0.2.A.0.62
On your phone first:
- Enable USB Debugging
- Settings/Developer Options/USB Debugging
- Enable Unknown Sources
- Settings/Security/Unknown Sources
Flashtool
- Install and open Flashtool
- Drag and drop the .ftf file you downloaded earlier
- Leave all options default
On your phone
- Disconnect from USB
- Power off, wait 5 seconds
- Press and hold the back button
- Plug in the USB
- Wait until Flashtool starts doing it’s magic, release the back button
After Flashtool is done
- Disconnect from USB
- Start phone
- Done