Since rooting directly in 4.0.4 is not possible, one needs to downgrade to a rootable GB ROM to root. (Skip this step if you are already in GB).
To Downgrade, you need to flash an old GingerBread ROM FTF to your device.
Download FTFs from here:
I’m not providing any link for 4.0.2.A.0.62 build,Because the easy tool kit we’ll use to root the device DOESN’T work with 4.0.2.A.0.62 build,trust me I tested it with that build disregard of it was mentioned on the download page.
Xperia Mini (ST15i)
4.0.2.A.0.42 – click here
Xperia Mini Pro (SK17i)
4.0.2.A.0.42 – click here
PreRooted 4.0.2.A.0.69 – click here - Flash via Recovery
Xperia Mini Pro (SK17a) – “a” model
4.0.2.A.0.58 – click here - Branded Mexico Telcel firmware
Xperia Active (ST17i)
4.0.2.A.0.42 – click here
Live with Walkman (WT19i) ****MY DEVICE****
4.0.2.A.0.58 – click here
Xperia Ray (ST18i)
4.0.2.A.0.42 – click here
Xperia Arc (LT15i)
4.0.2.A.0.42 – click here
Xperia Arc S (LT18i)
4.0.2.A.0.42 – click here
Xperia Neo (MT15i)
4.0.2.A.0.42 – click here
Xperia Neo V (MT11i)
4.0.2.A.0.42 – click here
Xperia Play (R800i)
4.0.2.A.0.42 – click here
Download the flashtool from here.
Then use flashtool to flash the ROM, as described in the images below.
IMPORTANT NOTE - IN THE LAST SCREENSHOT,INSTRUCTIONS SAYS TO PLUG THE USB CABLE IN THE PHONE WHILE HOLDING THE BACK BUTTON,BUT IT DOESN’T WORK TIS WAY. YOU HAVE TO HOLD THE “VOLUME DOWN” BUTTON THEN PLUG THE USB INSTEAD OF BACK BUTTON. WHEN YOU START THE FLASHING,NO MATTER WHAT IT SAYS TO HOLD BUT REMEMBER,TO PLUG YOUR XPERIA DEVISE IN FLASH/DEBUG MODE,YOU HAVE TO HOLD THE “VOLUME DOWN” BUTTON,NOT BACK BUTTON.
II. Root the GB ROM:
(Skip this step if you are already in Rooted GB)
Download the DoomLord’s Easy Root Toolkit for Xperia Gingerbread. Extract all the files, Connect the device to the computer, and run the file “runme”.
Follow onscreen instructions.
When done, device will reboot, and you should see application called SuperUser in your app drawer.
If you want to run the rooted GingerBread,you may stop here and enjoy superuser utilities right away. But if you want your ICS experience back,then you are free to proceed.
III. Preparations to root 4.0.4 ROM:
Download the XperiaRoot.rev3. Extract all the files and connect the device to the computer, and run the file “01-local-prop”.
Follow the on-screen instructions. When done, /data/local.prop should be edited as desired.
Here, do not do anything on cell and directly proceed to Flashing the 4.0.4 FTF.
IV. Flash 4.0.4 ROM:
Download the FTFs from the following links:
Xperia Mini Pro:
SK17i: Here or Here
SK17a: Here or Here
Live with Walkman:
WT19a: Here
WT19i: Here
Xperia Mini:
ST15: Here OR Here
Xperia Active:
ST17i: Here
Xperia Ray:
ST18: Here OR Here
Xperia Arc S:
LT18: Here OR Here OR Here
Xperia Neo V:
MT11: Here OR Here
Xperia Neo:
MT15: Here
Xperia Arc:
LT15: Here OR Here
Xperia Pro:
MK16i: Here
In case some links are dead try out this ftp site (open preferably in Internet Explorer):
ftp://giosal.webhop.net/ Go to Incoming and then Sony Updates, and you can find the ftfs there.
Proceed as you did in downgrading, placing the 4.0.4 firmware in /firmware folder this time; and selecting it in step 4. In step 4, make sure the check boxes look like this.
Proceed with the flashing Process.
Here, you can also use PC Companion or Sony Update Center if you want for updating. While updating with SUS, make you sure you perform the recommended install and do not wipe data.
Once the flashing is done, turn ON the device (If using PCC or SUS you will be prompted to turn ON). During the first boot, the device might reboot. In that case, after second boot it will turn on normally.
In case it gets into bootloop, proceed to next step right away.
Else proceed to next step with your phone turned ON.
V. Root 4.0.4 ROM:
From the Xperia-ROOT.rev3.zip file you downloaded earlier in step 3, open the file 02-push-root-files.cmd.
Follow the on-screen instructions. Device will reboot. Once re-boot is done, you will have SuperUser installed in the 4.0.4 ROM.
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