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Hacking the File System of the K750
With access to the file system, you
can change many system settings, delete predefined
content, change menu icons and layout, silence the
camera, remove operator logo, and many other cool
The techniques below assume you have some
understanding of how to access the internal file
system of your phone.
You can remove the storage limitation so that you
can store more than 500 sms�s. This trick works by
changing the sms message store to the tpa folder,
where the message limitation is not in force
Copy the file /ifs/settings/messaging/pref_store.txt
from the phone to the computer, make a backup, then
edit it to read /tpa instead of /smsdata, then delete
the file from the phone then copy in the new version.
Now you need to create the message store in the /tpa
folder. Create the following folder structure in the /tpa
The camera sounds depend on the files
camerashutter.3gp and camerafocus.3gp. You can change
the camera sounds by replacing these files with your
own versions. The new sound files must have the same
names as the old ones, and be in 3gp format,
preferably audio only.
Delete the existing files from /tpa/preset/system/sound
and then copy in the new versions.
The camera sounds come from the files
camerashutter.3gp and camerafocus.3gp. If these files
don�t exist, the camera is silenced. This means the
camera makes no sound even if the phone is not in
Silent Mode. You could also delete only
camerafocus.3gp for example, if you only want the
shutter sound to be heard.
The camera sound files can be deleted from /tpa/preset/system/sound
Method 2: Enable Silent Mode for camera sounds
This method will enable you to disable the camera
sounds by turning on Silent Mode. When not in silent
mode, camera sounds will operate as normal.
Copy the customize.xml file in /tpa/preset/custom to
the computer and make a backup. Open customize.xml in
an editor and change the following setting from false
Save the file then delete the existing customize.xml
on the phone and copy in the new version.
Important: You will have to do either a
settings or master reset before this trick will take
effect. Once you do, you will be able to silence the
camera on demand, simply by putting the phone into
All Java midlets can be backed up by copying the
jar and jad files from the phone to your computer.
The jar and jad files at can be found here: /tpa/preset/system/ams
To backup your games, simply copy the jar and jad
files in this folder to your computer.
The games will need to be reinstalled if you delete
them from the phone and then later want to reinstall.
You can�t just copy the old files back into the ams
folder. But you can use the old jar and jad files you
copied from the phone to reinstall the game (the same
way you would install a game normally)
You cannot delete the pre-installed content from
the handset itself, but with access to the internal
file system you can delete ANY pre-installed content
you want. Simply browse to the folder where the preset
content is stored and delete it.
Here are the folder locations for the various
Notes on Pre-installed content: Sometimes
pre-installed content has a shortcut in the user
folder pointing to the actual image which is stored in
the /tpa/preset/default folder. For example, the
shortcut file �El Trumpet.mp3.@� in /tpa/user/audio
points to the actual image �El Trumpet.mp3� which is
in /tpa/preset/default/audio. Delete both the shortcut
and the actual image.
The various system sounds are stored at /tpa/preset/system/sound.
If you replace them with your own versions you can
change the sound the phone makes for a given system
sound. For example you can replace the noisy
lowbattery.mid with something more subtle.
Replacement sounds should have the same name and audio
format (mid, mp3, amr) as the original, and be about
the same length.
To replace a system sound, delete the existing sound
from /tpa/preset/system/sound and copy in your own
Startup and shutdown images and sounds are located
in various locations. To change, simple delete the
existing file, and copy in your file with the same
name. Here are the various names, file sizes, formats
Boot image: SPLASH in /tpa/preset/system/settings/
This is the 176x220 pixel image displayed at boot up,
called the Splash Screen. Can be in gif, bmp or png
format. Animation not supported.
Startup Image: STARTUP_IMAGE_SEMC in /tpa/preset/system/settings/
This is the 176x220 pixel image shown after the Splash
screen. This image can be chosen by the user in
settings/display/start-up screen so you don�t need
internal file system access to change this image.
Shutdown Image: SHUTDOWN_IMAGE_SEMC in /tpa/preset/system/settings/
This is the 176x220 pixel image that is shown when the
phone is shutting down. Can be in gif, bmp or png
format. Animation is supported, but total number of
frames should be kept low, and gif should not be set
to repeat animation, as this will slow down the
Startup Sound: STARTUP_SOUND_SEMC.mid or
STARTUP_SOUND_SEMC.mp3 in /tpa/preset/system/settings/
This is the sound that plays when the phone starts up.
Shutdown Sound: SHUTDOWN_SOUND_SEMC.mid or
SHUTDOWN_SOUND_SEMC.mp3 in /tpa/preset/system/settings/
This is the sound that plays when the phone is
Sony Ericsson or your operator install links at the
top of every folder in your phone�s file system to
websites with their content. These are pretty useless
to most of us, and serve only to clutter up access to
our files. The links are stored in two locations
within the file system.
Firstly, as xml files in folders within /tpa/preset/system/custmenu.
For example the folder GAMES_HOOK_1 might contain an
xml file pointing to the operator�s game download
page, as well as an image used as the icon.
Secondly, the links are cached in the files
cust_menu_data.dat and cust_menu_done_unpacking.dat
that sit in /tpa/preset/system/custmenu.
To get rid of an operator link, you need to delete the
folder in custmenu for the relevant link, then delete
the files cust_menu_data.dat and
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