You might want to look at the post bellow this...

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...well ok... first download RCOEdit

then download De-WHATEVA 5.50 rco's

open the rar and drag sysconf_plugin_about.rco to your desktop


open rco edit and click the button in the top left corner saying "open RCO"
(Find the rco and open it)


You really only want to edit the ones tagged with EN...

You can replace the other ones tagged with JP and what not with a 1x1 black png since you'll never see em anyways...

(if you want to see a better preview than the small square in the bottom right corner than just double click it and a window will pop up... you can stretch it so you can see the full image...)


Anyways... grab an image you want to edit and select the extract button (or just copy the sizes under the preview and with your photoediting program type them down...)


After you're done editing your image

save as a png (Try other filetypes and quality levels too... I'm only saying png because that's what I'm doing at the moment...
You can ask other people how to make low resource images for the "about psp" slideshow... as I've little experience on this part...)

go back to rco editor and select the image you want to replace...
Press the Replace button and search for your image

(it won't tell you anything, nor is there a save button.  So just wait a few seconds before closing the program)

Now turn your psp on in recovery mode

select Advanced

select Toggle Flash0

on your computer go to vsh/resource

and find sysconf_plugin_about.rco

copy this file onto your computer into a "backup" folder

now copy your edited sysconf_plugin_about.rco into your flash0

exit recovery menu, restart your psp and then go check how you did...