[last updated 04/13/2008]
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The following is the
default startup image that comes with the TomTom ONE LE:

To Change this image,
follow the instructions on this page
1. Find any image you would like to use for the startup
screen.
I chose the following image which I photographed myself from
Niagara Falls and then I overlayed the TomTom ONE logo for my own
startup image:

2. Using your
favorite image editing software, resize and save the image using the
following specifications:
a) 320 x240 pixels (for non-XL series)
480 x 272 pixes (for XL and GO
5xx and 9xx
series)
b) 300 pixels per inch
c) Windows bitmap (*.bmp)
d) Filename =
splash.bmp (note: the TomTom is case sensitive, so make sure
there are no capital letters)
= splashw.bmp for TomTom's with 4.3" screens (ONE XL, ONE XL-S, etc.)
More information can be found on TomTom's Website >>>HERE<<<
You also have the option of using the
following webpage that will convert the image for you automatically:
The following pages have some custom splash screens that you can download, if interested:
3. Plug in your TomTom to your PC
4. Turn on your TomTom
5. Using Windows Explorer, find your TomTom device (it will
have the little red TomTom icon next to it:
)
6. Click the little "+" sign next to the TomTom icon to
expand the folders:

7. Make a backup of
the existing splash.bmp
(or splashw.bmp) file that is located in the root folder of
your
TomTom device.
- This
will be the
folder
in my
example.
8. Once the backup has been made, copy the resulting file
from
step #2 above into the root folder of your
TomTom device. If
you are asked to overwrite the existing file, say 'YES'.
9. On your windows lower right icon task menu, click on the
safely remove hardware icon: 
10. When Windows states it is safe to remove your hardware,
disconnect your TomTom from your PC.
11. Turn off your TomTom
12. Next time you turn on your TomTom, you should see your
new custom image like the following: