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[How-to] Repair Damaged Bootloader + Trim Area [Red Led][Unknown Device]

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Alejandrissimo

Senior Member
Jan 12, 2011
777
624
unlock-bootloader.com
Hello again :D

Sometimes we can brick our devices by a bad unlock, flashing process, or simply bad luck.

The phone doesn't turn on and there is a Red Led Of Death when pressing power button. Even with a GREEN led when we plug the phone with back key pressed the computer detect the phone as "unknown device" so there is no chance to get fixed by Flashtool or SEUS/PC Companion.

Well this problem normally means that the bootloader is broken or damaged. So, in order to fix it we need to write a new SEMCboot and after this we were able to flash a full and fresh firmware with flashtool and unbrick our Xperia.

This process like unlocking process requires SETool dongle/box and a paperclip to make a testpoint to put the phone in flash mode and be able to write the SEMCBoot.

I can help to anyone with a bricked Xperia Arc/Play/Neo/Pro just make send me a PM.


Like unlocking process you will need this 3 programs:

SETool software for unlocking
USB Over network client for remote dongle
Teamviewer client for remote support and guide


anyway if you want me to buy a Dr. Pepper just
 
Last edited:

Alejandrissimo

Senior Member
Jan 12, 2011
777
624
unlock-bootloader.com
Sometimes even after fix the bootloader the phone doesn't want to boot. In most cases this is by a damaged TRIM AREA (TA).

The trim area is a part of softwere stored in eeprom so it can be read and write with the proper software like SETool.

Read and Write trim area is very easy but you should know that some sectors of the TA are unique for you phone, lets call it Security Units.

The process for repair trim area is indeed very easy.

For sure we need Testpoint like in unlocking or bootloader repair process.

1. Backup Security Units with this script:

Code:
taread:00020851
taread:000207D3
taread:000207Da

2. Write a Working TA backup from another phone (same model)

3. Restore Security Units.

Thats all, now your phone should boot well :D but is 90% possible that you dont get Signal so for fix that we need to unlocking.

If this last thing is needed you can refer to this thread:

http://forum.xda-developers.com/showthread.php?t=1232033
 
Last edited:

taliani2

Member
Nov 4, 2010
18
1
DJELFA
huh u

huh u again . plz mention it is not a free tool so everybody can understand what is going on......????!!! you said it is free ?? free as 20 dollars or what i sent u a pm and you said pay . how could it be lol
 
Last edited:

B-vb

Member
May 8, 2010
39
2
Thanks Alejandrissimo!!

Alejandrissimo is the best!!

Two weeks ago, I tried to flash cyanogenmod7, but I'm a n00b, so ofcourse it went wrong. My device(Arc) wouldn't boot anymore, I tried some things and suddenly it even wouldn't connect with fastboot..

So I saw this topic and some other ones from Alejandrissimo, Many comments praising him for his patience and help, that's why I contacted him, and that evening he helped me getting my phone working! He really Knowles where he is talking about!

Only problem I had left was NO SIGNAL, I asked Alejandrissimo if he could help me with that and yes he said he could. For almost a whole week, oh well. Much time difference, so it was hard to catch eachother we tried flashing it again and again in different ways. Yesterday he thought he had the answer, we tried it, and it worked!! I'm so happy he helped me getting my phone back! So so many thanks again Alejandrissimo!!

In order to unlock my trim area for my SIM I had to pay 24USD, cause Alejandrissimo had to buy credits at Sony Ericsson, but it was totally worth it!

Sent from my WORKING LT15i using xda premium
 
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aden1982

Member
Sep 17, 2012
45
2
aden
happened to me this morning but with a lot of luck i managed to get the phone in the flashboot mode (with a lot of tries connecting to PC) and install the stock FW (as i read FW is light on the boot loader)and tried to boot (with a lot of tries) i got it boot once but stops after Xperia screen i tried and tried until it booted normally i want to get back to the custom ROM but afraid that problem accrued again.


NOTE:last night tried to install True licensed market to get paid apps for free the phone heated and heated i uninstalled it and connected the phone to the laptop to charge overnight.
 

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  • 13
    Hello again :D

    Sometimes we can brick our devices by a bad unlock, flashing process, or simply bad luck.

    The phone doesn't turn on and there is a Red Led Of Death when pressing power button. Even with a GREEN led when we plug the phone with back key pressed the computer detect the phone as "unknown device" so there is no chance to get fixed by Flashtool or SEUS/PC Companion.

    Well this problem normally means that the bootloader is broken or damaged. So, in order to fix it we need to write a new SEMCboot and after this we were able to flash a full and fresh firmware with flashtool and unbrick our Xperia.

    This process like unlocking process requires SETool dongle/box and a paperclip to make a testpoint to put the phone in flash mode and be able to write the SEMCBoot.

    I can help to anyone with a bricked Xperia Arc/Play/Neo/Pro just make send me a PM.


    Like unlocking process you will need this 3 programs:

    SETool software for unlocking
    USB Over network client for remote dongle
    Teamviewer client for remote support and guide


    anyway if you want me to buy a Dr. Pepper just
    1
    huh u again . plz mention it is not a free tool so everybody can understand what is going on

    :)
    1
    Thanks Alejandrissimo!!

    Alejandrissimo is the best!!

    Two weeks ago, I tried to flash cyanogenmod7, but I'm a n00b, so ofcourse it went wrong. My device(Arc) wouldn't boot anymore, I tried some things and suddenly it even wouldn't connect with fastboot..

    So I saw this topic and some other ones from Alejandrissimo, Many comments praising him for his patience and help, that's why I contacted him, and that evening he helped me getting my phone working! He really Knowles where he is talking about!

    Only problem I had left was NO SIGNAL, I asked Alejandrissimo if he could help me with that and yes he said he could. For almost a whole week, oh well. Much time difference, so it was hard to catch eachother we tried flashing it again and again in different ways. Yesterday he thought he had the answer, we tried it, and it worked!! I'm so happy he helped me getting my phone back! So so many thanks again Alejandrissimo!!

    In order to unlock my trim area for my SIM I had to pay 24USD, cause Alejandrissimo had to buy credits at Sony Ericsson, but it was totally worth it!

    Sent from my WORKING LT15i using xda premium