[Sony Xperia T, TL, TX, V] Toledo_JAB:
This is from the WIKI page "Brick (electronics)"​

When used in reference to consumer electronics, a "brick" describes an electronic device such as a smart phone, game console, router, or tablet computer that owing to a serious misconfiguration, corrupted firmware or a hardware problem, can no longer function. The term derives from the vaguely cuboid shape of many electronic devices (and their detachable power supplies) and the suggestion that the device can only function as a large, heavy object.

The term can also be used as a verb. For example, "I bricked my MP3 player when I tried to modify its firmware."[1]

In one common sense of the term, "bricking" suggests that the damage, often a misconfiguration of essential on-board software, is so serious as to have rendered the device permanently unusable.

However, another use of the term "bricked" is understood to describe a situation where a device is unable to function even when the device does have potential to be recovered later to a working state. In this sense, the damage may be reversible; it is only during the period that it's unable to function that the device is deemed "bricked". This is often referred to as a "soft brick" whereas an unrecoverable device is a "hard brick".​

DON'T WORRY, BE PATIENT, YOU CAN FIX YOUR PHONE.​

This is common 'cents' worth more than a million dollars ;)

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For this guide I will define types of RESETS that happen when pressing both the POWER and VOLUME UP buttons.​

SOFT RESET = 1 vibration then let go of buttons (hold about 3 seconds); Like hitting REBOOT.

HARD RESET = 3 vibrations then let go (about 10 seconds); Like taking out the battery.*

*USE HARD RESET ONLY IF ALL OTHER TRICKS HAVE FAILED. RECOVERY FROM THIS DEEP LEVEL OF SOFT-BRICK WILL TAKE A LONG TIME​

Both can be used at anytime on a working phone. Most bootloops will also allow resets​

First try to use SONY's PC Companion to REPAIR your phone.

However if your bootloader is unlocked this may not work​

>>TO GET FLASHTOOL CLICK HERE<<​

If you need help with setting up & using FLASHTOOL >>CLICK HERE<<​

For most of the tricks you will need to have FLASHTOOL ready with a STOCK.ftf file waiting at a specific spot.

For help with finding your phones STOCK.ftf file click here

you will find instructions HERE on how to create your own STOCK firmware ftf file for your specific celluar carrier/region and model XPERIA. Each phone model has a different file for every android version. You will need a working phone to get your specific file, However you can use a GENERIC version that comes on international phones to recover from SOFT-brick

As the various 2012 XPERIA forums get organized, the moderators are trying to set up STOCK FIRMWARE ftf file download threads. As these threads come on line I will add them here. For now I will provide at least one file per phone for recovery.

MAKE SURE YOU USE A STOCK FIRMWARE FOR YOUR MODEL. Using the wrong models file will give you the very SOFT-brick your trying to fix. If your not sure then ask for help.​

Links to STOCK FIRMWARES

XPERIA P LT22

XPERIA V LT25

XPERIA S LT26

XPERIA SL LT26ii

XPERIA Acro S LT26W

XPERIA ION LT28

XPERIA TX LT29

XPERIA T LT30

XPERIA TL LT30at

XPERIA TIPO ST21

XPERIA TIPO DUAL ST21_2

XPERIA MIRO ST23

XPERIA U ST25

XPERIA J ST26

XPERIA GO ST27

XPERIA Sola MT27

Special THANKS go to the following XDA members for providing and maintaining links for the STOCK.ftf files above. Please click their THANKS button from here if you download.

Spectre51

championswimmer

Jozinek

hhlong89

gregbradley

zhuhang

irontech

Deadmask

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Click here to find out how to ready FLASHTOOL

DO NOT CONNTECT YOUR PHONE

First you need to have FLASHTOOL installed from HERE.

Now run FLASHTOOL.

From FLASHTOOL home, select the flash/lightning bolt button

Select FLASH MODE

Select your stock firmware file

WIPE: everything

If available EXCLUDE: TA. (this option is not available for all stock.ftf files, if it's there just exclude it)

Now click START button

After FLASHTOOL prepares files, you should get this screen (or similar depending on version of FLASHTOOL)

>>>>>STOP<<<<< FLASHTOOL is now ready for TRICKS

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Due to the amount and length of TRICKS, I have provided links to their post​

TRICK: FOR PHONE THAT WONT RESPOND; VIEW THIS POST FOR TRICK; Confirmed working on ION

TRICK: FOR PHONE THAT WONT RESPOND; VIEW THIS POST FOR TRICK; Confirmed ION

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These TRICKS require FASTBOOT access on the phone​

TRICK: FOR UNLOCKED BOOTLOADERS; VIEW THIS POST FOR TRICK; Confirmed ION

TRICK: IF YOU TRIED A HARD RESET (3 vibrations); VIEW THIS POST FOR TRICK

TRICK: TO USE FASTBOOT TO ACCESS FLASHMODE; VIEW THIS POST FOR TRICK; Comfirmed S

TRICK: USE FASTBOOT TO FLASH KERNEL; VIEW THIS POST FOR TRICK; Confirmed ION

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Please give feedback if any of these work and on what devices, I will update.​

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If you think I should add something new, either post it or PM me the content to add. Thanks to all those who help.​