[Resolved][Q] How to modify default.prop in nAa Kernel - Sony Ericsson XPERIA X10 Mini

Hi All,
Due to specific APP requirement, I need to modify some settings in kernel.
Here are all the settings I need to modify in default.prop:
ro.secure=1
ro.debuggable=0
persist.service.adb.enable=0
Here are the methods I already try:
1. Android Kernel; Kitchen 0.3.1 (http://forum.xda-developers.com/showthread.php?t=1659584)
Fail at extract kernel.sin, cannot found RamDisk
2. dsixda's Android Kitchen 0.224 (http://forum.xda-developers.com/showthread.php?t=633246)
Fail at extract kernel.sin, cannot found RamDisk
3. kernel.sin unpacker by DooMLoRD (http://forum.xda-developers.com/showthread.php?t=1262656)
Fail at extract kernel.sin, cannot found RamDisk
4. Tools in Xperia FlashTool
Fail...
The kernel.sin was extract from 2.6.32.61-nAa-jb-06.ftf. (http://forum.xda-developers.com/showthread.php?t=2136471)
I already start studying how to compile nAa kernel...
Is there any easier way to apply this change?
Thanks!

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Resolved.
It's because LZ4 compress format.
Here are the steps to Unpack nAa Kernel / Modify default.prop / Repack Kernel FTF
1. Decompress nAaKernel.ftf
You will got Kernel.sin
2. FlashTool => Tools -> Sin Editor => Select Kernel.sin => Extract data
You will got kernel.elf and kernel.partinfo
3. FlashTool => Tools -> Extrators => Elf => Select kernel.elf => Unpack
You will got kernel.elf.2 and kernel.elf.Image
kernel.elf.2 = ramdisk binary which compressed by LZ4!
kernel.elf.Image = zImage
4. Rename kernel.elf.Image to zImage
5. Rename kernel.elf.2 to ramdisk.lz4 and use LZ4 tools to decompress it
You will got a new ramdisk binary which was known as ramdisk.cpio
6. Rename ramdisk which extracted in step.5 to ramdisk.cpio
7. Copy ramdisk.cpio and zImage to ubuntu system.
8. Extract ramdisk.cpio and you will see default.prop
Make any modify you need.
9. Compress ramdisk folder to ramdisk.cpio
Here are the commands:
find . | cpio -o --format=newc > ramdisk.cpio
10. Compress ramdisk.cpio by GZip
Here is the command:
gzip ramdisk.cpio
11. Use Kernel Kitchen to create kernel.sin
Put ramdisk.cpio.gz and zImage in input folder under Kernel Kitchen.
Create kernel.sin by this tools.
12. FlashTool => Tools => Bundle Creation => select kernel.sin and loader.sin => Create your FTF
13. Flash into your device!
Although Puzzle & Dragons still cannot works on X10 mini with MiniCM10...
But I tried and learned something. :laugh:

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thanks for explaining the process
it is very useful for me .

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ramdisk.gpio decompress & compress
I tried to follow all steps, but isn´t work for me :'(
What I did:
1) decompress E15_2.6.32.60-nAa-05.ftf with 7z under windows: I get kernel.sin and loader.sin (OK)
2) extract data from kernel.sin with flashtool (0.9.16) under windows: I get kernel.elf and kernel.partinfo (OK)
3) extract elf from kernel.elf with flashtool (0.9.16) under windows: I get kernel.elf.2 & kernel.elf.Image (OK)
4) renamed kernel.elf.2 to ramdisk.lz4, and kernel.elf.Image to zImage; both under windows with f2 (OK)
5) decompress ramdisk.lz4 (3662KB) under windows (fastcompression . blogspot.com . es/p/lz4.html): I get ramdisk (4608KB) (it supposed to be renamed, so I expect it´s ok)
6) renamed ramdisk to ramdisk.cpio under windows with f2 (OK). Copy to ubuntu (QUESTION: zImage is used in ubuntu only in kernel kitchen???)
7) extract ramdisk.cpio (4718592- not command in the post): I used cpio -i -F ramdisk.cpio (9216 blocks); 4 new elements> default.prop init (files) android modules (directories)
8) I want to check I can extract & compress ramdisk (and make a "new" kernel), so I don´t do any modification
9) with only those 4 elements in the directory (default.prop init (files) android modules (directories)), I make ramdisk: find . | cpio -o --format=newc > ramdisk.cpio (PROBLEM: alert message "ramdisk.cpio has been increased, 4718080 new bytes has not been copied" other line "27647 blocks")
Original ramdisk.cpio was 4718582, but the new one is 14155264... 3 times more!!! I think the problemis here, but I don´t know how to resolve it
I have done the rest of the manual
10) kernel.sin created with kernel kitchen 0.2.3 under ubuntu (last kitchen version gives me an error, because in despite of choose create kernel.sin from zImage and ramdisk, it tries to do a ftf from kernel -not available- and ramdisk)
11) ftf creation under windows with X10 flashing tool 0.5.0.0 (flashtool 0.9.16 force me to write what device is for, but the cell is blocked, so I cann´t do it) OK
12) I tried to flash it, but it was aborted, so I expect ftf was incorrect
Sorry for wrote all: I thik the problem is extracting and compresing randisk.cpio, but I prefer to write everithing to be sure and be as clear as possible.
Any help will be great!