Hey guys am here to show you basically how to use a flash tool with our Xperia L 
Q. So why is a flash tool needed....
-> hmm, for flashing roms... yeah of-course and also to unlock/re-lock bootloaders.
Note :
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[COLOR="Red"] Disadvantages of unlocking bootloader? ( Doesn't matter if you have backed up your TA)
>> You may void your warranty.
>> You may loose some proprietary vendor software such as Bravia Engine, Download Music info etc. due to removal of DRM security keys.
>> OTA updater may refuse to update your device and pop up a 'Device's software modified' message.[/COLOR]>> So lets get started :
>> First of all download flashtool from : Search it / Google it
>>Then, Install it.
>> After that run your flashtool.
>> Then, If you want to unlock your bootloader then proceed with following steps :
>> Check unlocked bootloader :
>> Go to dialer
>> Type *#*#7378423#*#*
>> Service info > Configuration
>> Rooting status :
>>"Bootloader unlock allowed" - You can unlock your bootloader [After unlocking Bootloader unlock done
]>> "Bootloader unlock not allowed" - You cannot unlock your bootloader.
>> Search for Unlock bootloader Sony [Official site]
>> Then follow the instructions and receive unlock code.
>> Then go to flashtool and click BLU button
Then, Power off your phone.
>> After that connect you phone via usb simultaneously press volume down button
>> No indicator will glow
>> You have successfully connected your phone via Flashmode.
>> Flashtool put your unlock code.
>>> Woah!!! You Bootloader is Unlocked :laugh:
>>> How to Re-Lock your bootloader :
>> Follow the above steps
>> Connect your phone in Flashmode
>> Then press BLU button in Flashtool
>> Then Press Relock [Hope you are in stock room and on stock kernel or else u will get bootloop.]
Note :
Q. How to flash Stock Rom via Flash tool its easy just follow these steps :
Power off your phone [Keep it in power off mode [Till you setup the flash tool.] After setting up Press Vol Down Button simultaneously connect it via USB to PC it will get into flash mode [Drivers must be installed forehand or else computer may not recognize it ] Then go to your flash tool folder[Where you installed the flash tool.] Copy the C2105_15.0.A.1.31_CE.ftf to [Flash tool folder] firmware folder for example : [C:\Flashtool\firmwares ] Then, start your flash tool Press the flash button, Select flash mode Select the firmware & Leave all the settings as it is i.e. wipe data and cache selected, Select No final verification[I selected it, i don't know whats the use of it can anybody tell me ?? ] [After searching google i got this answer : It will check whether any error occurred during flashing, i had disabled it when flashing stock rom on my phone. so idont know what happens when we keep it unchecked.] The flash tool will setup files and start flashing, Don't touch your phone or press any button. Hurray you have successfully recovered your phone back to stock state. :highfive: :fingers-crossed:• Thanks & Credits : Androxyde & Flash Tool Xperia Z Thread
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