Sony Xperia U ICS 6.1.1.b.1.54 Wont Root! - Sony Xperia P, U, Sola, Go

Droidians,
I've been working 'hard' (for a noob) recently trying to desperately root my Xperia U ST25i. As mentioned in the title, the build is 6.1.1.b.1.54 and is running ICS 4.0.4. The bootloader has also been unlocked, but no matter whether I use the command line Bin4ary restore root or Flashtool in order to root it, it's just failing.
Any advice would be appreciated. Should I downgrade to GB and try from there? If so, where can I find a GB ftf file for my specific model/firmware etc?

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AW: Sony Xperia U ICS 6.1.1.b.1.54 Wont Root!
The .54 firmware is not rootable by the root and restore method. You have to flash .10 firmware-kernel to root and then flash .54 firmware-kernel.
Follow the steps in this thread: http://forum.xda-developers.com/showthread.php?t=2028139 and dont forget to hit the "thanks-button" for the OP.
Hope it helped

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-Chaz- said:
The .54 firmware is not rootable by the root and restore method. You have to flash .10 firmware-kernel to root and then flash .54 firmware-kernel.
Follow the steps in this thread: http://forum.xda-developers.com/showthread.php?t=2028139 and dont forget to hit the "thanks-button" for the OP.
Hope it helped
Click to expand...
Click to collapse
Need to unlock BL to change kernel?

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Max_Risk said:
Need to unlock BL to change kernel?
Click to expand...
Click to collapse
No, it's a stock kernel, flash with flashtool.

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Root xperia u
how how to flash pls screen short i downloaded all file and my xperia u unlocked boot loader for sony unlock bootloader official site
so pls show me how to root firmware 6.1.1.54 (4.0.4)

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recovery for xperia p
i_4_u89 said:
how how to flash pls screen short i downloaded all file and my xperia u unlocked boot loader for sony unlock bootloader official site
so pls show me how to root firmware 6.1.1.54 (4.0.4)
Click to expand...
Click to collapse
Please share any link or screenshots, I need to install recovery on my xperia P

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Sony Xperia U ST25i 4.0.4 [built: 6.1.1.b.1.54] official firmware (sim-unlocked)
-Chaz- said:
The .54 firmware is not rootable by the root and restore method. You have to flash .10 firmware-kernel to root and then flash .54 firmware-kernel.
Follow the steps in this thread: http://forum.xda-developers.com/showthread.php?t=2028139 and dont forget to hit the "thanks-button" for the OP.
Hope it helped
Click to expand...
Click to collapse
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Can you help me because i need a stock official firmware for my Sony Xperia U ST25i 6.1.1.B.1.54 sim-unlocked....
Because my root status said it isnt installed properly and i want to flash an official firmware and re-root it... plz help!!! thx

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Hi all, i got a xperia u and try to root, i know what to do, but the problem is thet i flash the kernal from solas and not from U O_O now i have the right xperia u tft, but when i try to flash, i cant because i dont have the right drivers for the flashtool detect the phone!
( Can some one PLZ help me here )!
---------- Post added at 10:09 PM ---------- Previous post was at 10:05 PM ----------
flashtool says:
29/000/2016 22:00:34 - ERROR - Drivers need to be installed for connected device.
29/000/2016 22:00:34 - ERROR - You can find them in the drivers folder of Flashtool.
29/001/2016 22:01:07 - INFO - Flash canceled
29/001/2016 22:01:21 - INFO - List of connected devices (Device Id) :
29/001/2016 22:01:21 - INFO - - USB\VID_0FCE&PID_5171\BX902WW1AS Driver installed : true
29/001/2016 22:01:21 - INFO - - USB\VID_0FCE&PID_5171&MI_00\6&2B7ECC12&0&0000 Driver installed : false
29/001/2016 22:01:21 - INFO - - USB\VID_0FCE&PID_5171&MI_01\6&2B7ECC12&0&0001 Driver installed : true
29/001/2016 22:01:21 - INFO - List of ADB devices :
29/001/2016 22:01:21 - INFO - - BX902WW1AS
29/001/2016 22:01:21 - INFO - List of fastboot devices :
29/001/2016 22:01:21 - INFO - - none