[Sony Cross-Device General] Toledo_JAB:
You can try to flash just the stock kernel.

First you need to download your stock ftf file. ftf= FlashToolFile, contains all the parts to completely wipe and install the Sony stock firmware. It can also be used to flash only certain parts ;)

ST21i_11.0.A.4.22.ftf

Flashtool does not need to see/recognize the phone, to flash the phone.

Flashing a stock ftf will not effect the internal or removable SD cards. If your phone had a SD card in it when it was running, it should be in it when you start it. Some apps may have data on it.

Below is my post on how to flash the entire stock firmware and will make the phone like brand new. This process is the same as the PCC repair function.

HOWEVER, That's not what you want to do.

So at steps 7 & 8 I will make the following changes.

STEP 7: Make sure ONLY WIPE CACHE is checked. This should save the apps and user data.

STEP 8: Exclude everything but the KERNEL. This will allow only the stock Sony kernel to be flashed. The new kernel should get you past the Sony boot screen. If the flash was successful then disconnect the phone and hold power button until 1 vibration, this should reboot and start the phone.

This step is your best bet. It will only replace the kernel, user data is not touched.

The next step is only if the above has failed. I am not sure what data may be lost when flashing the system & fota.

STEP 8a: If you still get stuck, either at the Sony or the Xperia boot screens, then un-check the rest of the exclude box's for the SYSTEM, BASEBAND, & FOTA. This will include ALL parts of the ROM for flashing. Leave the wipe box the same, ONLY check CACHE. Flashing the system/FOTA may erase some data but it may let you start the phone to make some of the backups.

Use the phones Google account to sync contacts and others. Find it in the system settings/accounts/Google

Make sure and click each one to manually sync them.

Also in the apps you should find BACKUP & RESTORE. backup everything. This should save the apps, data, system settings....

If all of the above tricks have failed, then you are left with doing a PCC repair or a complete stock firmware wipe & install.

Either way will give you the same result.

However if you use PCC, you may have to leave the phone connected while it downloads the entire firmware and then flashes it automatically. Depending on your connection speed, to download about 400MB, this can take 30+ minutes. (for me it took about an hour. with 1.5M DSL)

For flashtool, you download the stock ftf file for your device once and save it to PC. A total flash should last about 5-10 minutes, with the last ~10% appearing to slow down.

FLASH mode, is used by FLASHTOOL and can be used on every model of XPERIA phone with a locked or unlocked bootloader. FLASH mode will give a soild GREEN notification led when connected. To connect in FLASH mode:

Start with the phone turned off (or in between loops for some tricks)

Press and HOLD the volume DOWN button. (don't let go ;) )

Now connect to a PC using USB

If all went correctly you will get GREEN led, then let go of button :)

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To recover your phone you need to have FLASHTOOL ready and waiting at a specific spot.​

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

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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For help with finding your phones STOCK.ftf file

CLICK HERE​

You can use the file for your XPERIA model below to recover from SOFT-brick.

To make your models specific .ftf file after you recover, you will find instructions {IN THIS POST}

MAKE SURE YOU USE A STOCK FIRMWARE FOR YOUR MODEL XPERIA. Each phone model has a different file. Using the wrong 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 in the post you download from.

{dimon2242} {championswimmer} {Yakandu} {NomNomM} {zhuhang} {Spectre51} {hhlong89} {gregbradley} {Jozinek} {TeamMex} {Deadmask} {irontech}

PC Companion can interfere with FLASHTOOL. Make sure it is NOT running when using FLASHTOOL.​