Okay we all know about the firmware 2 exploit where you put certain files in photo folder, when you then go to photos your psp loads h.bin or if you dont have thr right wallpaper it freezes, Heres how you can use any wallpaper without psp crashing and be able to load the fw2 h.bin while also being able to view photos.
I suggest you test with the Hello World app.
The trick is on where you put the files.
1>Put h.bin (hello world or any other app) into the root of your psp
2>Put frame_buffer.png in PSP/PHOTO as usual
3>Create a New folder in PSP/PHOTO - call it HACK
4>Copy frame_buffer.png to PSP/PHOTO/HACK - you will now have 2 frame_buffer.png files on your memory stick
5>Put overflow.tif into PSP/PHOTO/HACK
Now no matter of your background you can use your photo section.
When you want to run the hack you can set frame_buffer as your wallpaper
When frame_buffer is your wallpaper go into photos, you can use it as you would normally do for viewing photos etc
To launch h.bin homebrew - Click on the Hack folder on the psp menu - it will list the images (frame buffer and overflow) and you will notice homebrew code runs aswell.
As you have to do in overflow exploit, reset your psp by holding the power button for 3 seconds.
Available apps you can use at the current moment are these:
Firmware 2 Dumper
v2 - v1.5 Downgrader
Also there are modifications of hello workd to display other text as well as a few demos.