note: unlocking bootloader voids your warranty but hey you can relock your bootloader and your phone is under warranty once again
note : after unlocking bootloader of Xperia e c1504/1505 c1504 goes into bootloop and in some cases c1505 also faces bootloop.so backup all your data.
1)- open the dialler
and enter *#*#7378423#*#* to access
the service menu. In your device, tap Service info >
Configuration > Rooting Status . If
Bootloader unlock allowed says Yes,
then you can continue unlocking your phone..
if its no then please stop and don't try the next steps.
2)- go to developer options in your phone and enable usb debugging and in security options tick on allow installation of non market apps.
3)- download http://adbdriver.com/upload/AdbDriverInstaller.exe and install adb drivers installer on pc,open it and connect your phone to pc and install the adb drivers.
4)- download flashtool http://androxyde.github.io/index.html?1350585408000 and install on pc.
5)-open flashtool folder>flash tool drivers>flash tool drivers and then select fastboot drivers and flashmode drivers and install them.
6)- download http://www.androidfilehost.com/?fid=9390169635556426292 and extract it adb_fastboot_and_other_tools.zip and place in on your desktop/any other drive.
7)- go here http://unlockbootloader.sonymobile.c...9eae2b99647ffc .
fill your details and then check your email inbox for bootloader key.
8)- Turn off your device.On your device, hold the volume up at the same time as
you connect the device to the computer
with a USB-cable. (volume up is the fastboot button)
9)- on your pc start>type cmd and open a command prompt and navigate to adb_fastboot_and_other_tools folder . if you don't know how to use a command prompt then. see this http://m.youtube.com/watch?client=mv...ldescription=1
10)- Enter 'fastboot.exe -i 0x0fce getvar' without the single qoutes in the command prompt and verify that you get a
response back (for example "0.3"). This
means your device is connected
11)- enter 'fastboot.exe -i 0x0fce oem unlock
0xKEY' ,without single quotes where KEY is the unlock boot
loader key you got in step 7 .. after doing this you will get reply as done on pc and your bootloader will be unlocked.
using the above instructions you can unlock other Xperia also which has bootloader unlock allowes to be yes.backup your data before unlocking.only the fastboot buttons will vary. you can get it here -
steps precisely for Xperia e c1504/1505 facing bootloop after unlocking bootloader -
1)- download stock ftf file https://docs.google.com/file/d/0B_d8...UTA/edit?pli=1 and copy it in flashtool>firmwares.
2)open flashtool click thunder icon select flash mode and select the stock ftf.
3)- connect Xperia e as shown in step 8 but with. holding volume down button instead of volume up. you will get a green led
4)- original firmware will get flashed and initial startup will take about 5 minutes. so be patient.
steps for relocking Xperia e bootloader
1)- download https://docs.google.com/file/d/0B_d8...it?usp=sharing
2)- flash it in same way as you flashed the original firmware..
note)- after relocking bootloaDer//on a locked bootloader if you face bootloop then use Sony update engine (download from official website) to flash original firmware.
hope my thread helps.
here is the video https://www.youtube.com/watch?v=V2D6XDLXsuw