[Xperia Arc Q&A, Help & Troubleshooting] Daxomega007:
Yes Your Phone Will Work Again

Dont Worry The Same Thing Happened To Me With My Pro And There Is A Way To Fix It I Will Find It And Be Back In 3 Minutes With An Answer

Ok I Am Back And Found Some Instructions I Have a Way To Do It But These Seem Simpler Than Mine.

Hi all,

So you have unlocked the bootloader of your Xperia Pro MK16a/i and rooted it too.. You got a notification for a newer software to be available and you downloaded an over the air update, installed it, the phone says that it needs a reboot and to your surprise the phone doesn't turn on.

The symptoms for this problem are:

1. The phone vibrates for half a second when you press the power button and does that in a never ending loop

2. The green led keeps blinking when you press the power button.

This is not some method that i had developed but i just found a thread in a Japanese website and after struggling with the google/microsoft translation, i thought it would be better to help all the other users and not face all the struggles that i went through.

How to bring your phone back to life without the help of a Sony Ericsson service center? Keep reading.

Things that you need to have/check before beginning the process.

1. An Xperia Pro MK16a/i with the symptoms mentioned above

2. A USB cable

3. Flashtool

4. SEUS Software (which has been used for at least once for your phone)

5. Patience

First off, just rush to the SEUS installation folder in your PC to this path

C:\Program Files\Sony Ericsson\Update Service\db\13740270\blob_fs

Look for a file named FILE_278020564 in that folder.

If yes, continue reading.

If no, i'm not sure if the files from other users work. Experts need to help regarding this matter.

Copy the file FILE_278020564 to any location that you wish

Download the software ConvertTool and copy and place the file FILE_278020564 into the ConvertTool folder and then drag and drop the file onto the file SeusDecrypt.bat

A .tgz archive of the FILE_278020564 will be made in the same folder. Now extract the .tgz archive created (Use 7zip archiver to extract the file)

A .tar file will be created now. Now rename that file as loader.sin

Now Extract the file Xperia Pro Relock bootloader.zip to another location and copy and replace the loader.sin file in the folder with the loader.sin that you just renamed.

Now its time to repackage the file so that it can be flashed onto your phone.

Download and install Flashtool software (you can easily find it, just Google it) and in the software go to Advanced>Bundle creation

Now select the folder Xperia Pro Relock bootloader, you'll be able to view the two files (loader.sin and preset.ta) in the folder list of Flashtool software.

Select each file and then click on the -> to move the files into Firmware Content, type in the details in the tabs above.

Device: MK16a (or) i [whichever phone yours is]

Version: 4.0

Branding: A.2.335 [Don't ask me why we need to type in these details because i do not know, experts can help if its not mandatory]

Click on Ok in the flashtool software and a .ftf file would now be created in the path shown below

C:\Flashtool\firmwares

Example: MK16a_4.0_A.2.335.ftf

Now Open the Flashtool software once again and click on the Flash icon and enter into Flashmode and the software lists out the firmwares in the firmwares folder of its installation. Select the file MK16a_4.0_A.2.335.ftf and then leave everything as default and press OK.

Do as the software asks you to do.

1. Unplug the device

2. Power off the device

3. Press the back button and hold it

4. Plug the USB cable.

The software shall recognize the phone and flash the relocked bootloader into the phone file system. The phone would not work now.

For the phone to work, you need to update your phone normally using SEUS and it would let you do an update without any The phone software has been modified and cannot be updated error. (I would prefer a Factory settings+Update mode of update)

Note: In case the flashtool doesn't detect your phone, you need to install PC companion software in your PC. Hopefully it installs the USB drivers necessary to detect your phone.

After the update is done, restart the phone and it should normally boot like it was in the box when you bought. Happy Ending..

This method is not mine and all credits goes to Mydroidn.