1. Yes there is a way to hack your friends psps, Download hellcatz recovery flasher to convert your battery to a pandora, and make a mms. Then you can plug your psp into a wall charger then put your battery back in and change it back to a normal battery in hellcats.
2. As far as I know the psn is not accessible to cfw, but the whole browser?
Edit, dang xavis you beat me,
but yeah it does depend on your friends fw version too.