Newbie Help

Dude your in the gameboot/Cintro section how did you pass the help section?????

Go to the help section there are answers there.

pspset is a gameboot app thing, it helps you run gameboots I think. It uses a 1.50 kernel though, so your slim can't run it. And I'm not sure if there is a gameboot app for 3.90, so you might have to hard-flash the gameboot in your psp's flash.

Connect a USB cable to your PSP, then go to the XMB.
Press the 'HOME' button and then go to the 'USB DEVICE' option.
Switch it to flash0 and then enter USB mode.
Then your flash0 folders pop up on your computer then go to vsh/resource/'Insert Gameboot.pmf here'
Make a copy of the original gameboot for safe keeping.

Is this the gameboot you are looking for?
There are multiple videos of this gameboot. You can message one of the people to ask for the gameboot.
or if you google it you could probably find it.

Ok sorry about that first message(Know-it-all older brother!!!)