[XPERIA X8 General] SpyderX:
Thumbs up for this :). It's a great change rather than reading through my very wordy but thorough guide here: http://xdaforums.com/showthread.php?t=1254225

Still, if anyone wants a tutorial on how to flash custom kernels, how to return to stock kernel and how to relock their bootloader, it's all embedded in the first post of my guide somewhere and also below :D.

Cheers :cool:,

SpyderX

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HOW TO RELOCK BOOTLOADER :

0. Flash back stock kernel using "Repair" option in SEUS or by using Flashtool (if using Flashtool either flash stock firmware or flash the appropiate .ftf file below):

X8 (E15) and W8 stock kernel:

Download link: http://www.mediafire.com/?zb3zhdkodgy55ch#1

Direct download link: http://db.tt/gg2jJVZi

X10 mini pro (U20) stock kernel:

Direct download link: http://db.tt/S7Nm4WZx

X10 mini (E10) stock kernel:

-Will be added at a later date-

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If you relock your bootloader while using a custom kernel your phone will be bricked!

1. Download S1tool and extract it to an appropiate location on your PC (not needed if you already have s1tool) . (Credits go to the_laser for this tool)

S1tool post: http://xdaforums.com/show...0&postcount=26

Direct download link: http://db.tt/OrOQO33

2. Then, download and Install Flashtool v0.2.9.1 beta (don't use 0.3.0.0 as profile for our phones need to be added. It's simpler to use 0.2.9.1 beta) Here: http://xdaforums.com/showthread.php?t=920746

Download Link: http://www.multiupload.com/7H4JT35B6G

(Credits go to Androxyde and Bin4ry for this tool.)

After installing it, open the flashtool folder and open the drivers folder inside that. Double click on the ggsetup-2.2.0.10.exe file inside and install Gordon's Gate (needed for Flashtool to work).

Note: This Gordon's Gate Driver Installation will work for X8, X10 mini and X10 mini pro. I'm not sure about that of W8 but I think that is also supported.

Note: This Flashtool and Gordon's Gate installation is not needed if you have already done this.

3. Turn off your phone.

4. Launch s1tool.exe in the folder you extracted s1tool to.

5. Click on Restore button and then connect your phone to the PC in flash mode (press and hold back button while connecting your phone to the PC).

6. Wait for the process to complete. Congratulations! You now have relocked your bootloader!

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9. How to flash custom kernels:

a. Download the (kernel name).ftf file provided by the kernel developer

b. Download and Install Flashtool v0.2.9.1 beta (don't use 0.3.0.0 as profile for our phones need to be added. It's simpler to use 0.2.9.1 beta) Here: http://xdaforums.com/showthread.php?t=920746

Download Link: http://www.multiupload.com/7H4JT35B6G

(Credits go to Androxyde and Bin4ry for this tool.)

After installing it, open the flashtool folder and open the drivers folder inside that. Double click on the ggsetup-2.2.0.10.exe file inside and install Gordon's Gate (needed for Flashtool to work).

Note: This Gordon's Gate Driver Installation will work for X8, X10 mini and X10 mini pro. I'm not sure about that of W8 but I think that is also supported.

Then restart your computer.

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Generally you have to delete all the files in /system/lib/modules before flashing a custom kernel!

c. Put the (kernel name).ftf file in the /firmwares folder. (Don't flash any .sin files, flash only the .ftf file.)

d. Open Flashtool.

e. Click Flash.

f. Select (kernel name).ftf.

g. Turn off your phone.

h. Connect your phone in flash mode (only when the popup window prompts for you to do so). (To boot into flash mode, press and hold back button while connecting your phone to the PC using an usb cable).

i. Disconnect your phone (do so only when the popup window to prompts you to disconnect your phone).

j. Reboot and you have a custom kernel!

k. Confirm by going to Settings --> About Phone --> Kernel version. It should have the name of the kernel you flashed.

m. To flash back to stock kernel, download the appropriate file below and follow steps listed above.

X8 (E15) and W8 stock kernel:

Download link: http://www.mediafire.com/?zb3zhdkodgy55ch#1

Direct download link: http://db.tt/gg2jJVZi

X10 mini pro (U20) stock kernel:

Direct download link: http://db.tt/S7Nm4WZx

X10 mini (E10) stock kernel:

-Will be added at a later date-